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# Calculating with dc
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---
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tags:
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- bash
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- shell
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- scripting
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- arithmetic
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- calculate
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---
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![](keywords>bash shell scripting arithmetic calculate)
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# Calculating with dc
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## Introduction
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# Collapsing Functions
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---
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tags:
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- bash
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- shell
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- scripting
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- example
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- function
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- collapse
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---
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![](keywords>bash shell scripting example function collapse)
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# Collapsing Functions
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## What is a \"Collapsing Function\"?
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# Config files for your script
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---
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tags:
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- bash
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- shell
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- scripting
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- config
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- files
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- include
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- configuration
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---
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![](keywords>bash shell scripting config files include configuration)
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# Config files for your script
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## General
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# Editing files via scripts with ed
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---
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tags:
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- bash
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- shell
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- scripting
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- arguments
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- file
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- editor
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- edit
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- ed
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- sed
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---
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![](keywords>bash shell scripting arguments file editor edit ed sed)
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# Editing files via scripts with ed
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## Why ed?
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@ -1,6 +1,17 @@
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# Small getopts tutorial
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---
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tags:
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- bash
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- shell
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- scripting
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- arguments
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- positional
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- parameters
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- options
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- getopt
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- getopts
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---
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![](keywords>bash shell scripting arguments positional parameters options getopt getopts)
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# Small getopts tutorial
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## Description
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# Lock your script (against parallel execution)
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---
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tags:
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- bash
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- shell
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- scripting
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- mutex
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- locking
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- run-control
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---
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![](keywords>bash shell scripting mutex locking run-control)
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# Lock your script (against parallel execution)
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## Why lock?
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# pax - the POSIX archiver
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---
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tags:
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- bash
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- shell
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- scripting
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- POSIX
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- archive
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- tar
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- packing
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- zip
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---
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![](keywords>bash shell scripting POSIX archive tar packing zip)
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# pax - the POSIX archiver
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pax can do a lot of fancy stuff, feel free to contribute more awesome
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pax tricks!
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# Illustrated Redirection Tutorial
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---
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tags:
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- bash
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- shell
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- scripting
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- tutorial
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- redirection
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- redirect
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- file
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- descriptor
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---
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![](keywords>bash shell scripting tutorial redirection redirect file descriptor)
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# Illustrated Redirection Tutorial
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This tutorial is not a complete guide to redirection, it will not cover
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here docs, here strings, name pipes etc\... I just hope it\'ll help you
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# List of shell options
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---
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tags:
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- bash
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- shell
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- scripting
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- options
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- runtime
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- variable
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- behaviour
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---
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![](keywords>bash shell scripting options runtime variable behaviour)
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# List of shell options
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This information was taken from a Bash version \"`4.1`\", every now and
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then new options are added, so likely, this list isn't complete.
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# Bash's behaviour
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---
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tags:
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- bash
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- shell
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- scripting
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- startup
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- files
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- dotfiles
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- modes
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- POSIX
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---
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![](keywords>bash shell scripting startup files dotfiles modes POSIX)
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# Bash's behaviour
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FIXME incomplete
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# The basics of shell scripting
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---
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tags:
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- bash
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- shell
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- scripting
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- basics
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- learning
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- tutorial
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---
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![](keywords>bash shell scripting basics learning tutorial)
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# The basics of shell scripting
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## Script files
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# Debugging a script
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---
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tags:
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- bash
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- shell
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- scripting
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- bug
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- debug
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- debugging
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---
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![](keywords>bash shell scripting bug debug debugging)
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# Debugging a script
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These few lines are not intended as a full-fledged debugging tutorial,
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but as hints and comments about debugging a Bash script.
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# Beginner Mistakes
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---
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tags:
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- bash
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- shell
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- scripting
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- pitfalls
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- traps
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- beginners
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---
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![](keywords>bash shell scripting pitfalls traps beginners)
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# Beginner Mistakes
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Here are some typical traps:
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# Portability talk
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---
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tags:
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- bash
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- shell
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- scripting
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- portability
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- POSIX
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- portable
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---
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![](keywords>bash shell scripting portability POSIX portable)
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# Portability talk
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The script programming language of BASH is based on the Bourne Shell
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syntax, with some extensions and derivations.
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# Obsolete and deprecated syntax
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---
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tags:
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- bash
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- shell
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- scripting
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- obsolete
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- deprecated
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- outdated
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---
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![](keywords>bash shell scripting obsolete deprecated outdated)
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# Obsolete and deprecated syntax
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This (incomplete) page describes some syntax and commands considered
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obsolete by some measure. A thorough discussion of the rationale is
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# Handling positional parameters
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---
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tags:
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- bash
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- shell
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- scripting
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- arguments
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- positional
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- parameters
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- options
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---
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![](keywords>bash shell scripting arguments positional parameters options)
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# Handling positional parameters
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## Intro
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# Bash and the process tree
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---
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tags:
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- bash
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- shell
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- scripting
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- processes
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- pipes
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- variables
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- environment
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---
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![](keywords>bash shell scripting processes pipes variables environment)
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# Bash and the process tree
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## The process tree
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# Terminal codes (ANSI/VT100) introduction
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---
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tags:
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- bash
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- shell
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- scripting
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- colors
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- cursor
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- control
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- vt100
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- ansi
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---
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![](keywords>bash shell scripting colors cursor control vt100 ansi)
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# Terminal codes (ANSI/VT100) introduction
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Terminal (control) codes are used to issue specific commands to your
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terminal. This can be related to switching colors or positioning the
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# Arithmetic expressions
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---
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tags:
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- bash
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- shell
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- scripting
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- math
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- arithmetic
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- C
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- calculation
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- integer
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---
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![](keywords>bash shell scripting math arithmetic C calculation integer)
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# Arithmetic expressions
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Arithmetic expressions are used in several situations:
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# Basic grammar rules of Bash
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---
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tags:
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- bash
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- shell
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- scripting
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- grammar
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- syntax
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- language
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---
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![](keywords>bash shell scripting grammar syntax language)
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# Basic grammar rules of Bash
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Bash builds its features on top of a few basic **grammar rules**. The
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code you see everywhere, the code you use, is based on those rules.
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# Brace expansion
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---
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tags:
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- bash
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- shell
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- scripting
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- expansion
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- substitution
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- text
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- list
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- brace
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---
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![](keywords>bash shell scripting expansion substitution text list brace)
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# Brace expansion
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{string1,string2,...,stringN}
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{<START>..<END>}
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# Command substitution
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---
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tags:
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- bash
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- shell
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- scripting
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- expansion
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- substitution
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- text
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- variable
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- output
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- execute
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- stdout
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- save
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- result
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- return
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- value
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---
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![](keywords>bash shell scripting expansion substitution text variable output execute stdout save result return value)
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# Command substitution
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$( <COMMANDS> )
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# Expansions and substitutions
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---
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tags:
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- bash
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- shell
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- scripting
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- expansion
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- substitution
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- text
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- variable
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- filename
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- macro
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- wildcard
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---
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![](keywords>bash shell scripting expansion substitution text variable filename macro wildcard)
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# Expansions and substitutions
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Before executing your commands, Bash checks whether there are any syntax
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elements in the command line that should be interpreted rather than
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# Process substitution
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---
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tags:
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- bash
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- shell
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- scripting
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- expansion
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- substitution
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- text
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- stdin
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- stdout
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- save
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- capture
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---
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![](keywords>bash shell scripting expansion substitution text stdin stdout save capture)
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# Process substitution
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Process substitution is a form of redirection where the input or output
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of a process (some sequence of commands) appear as a temporary file.
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# Tilde expansion
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---
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tags:
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- bash
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- shell
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- scripting
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- expansion
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- substitution
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- tilde
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- home
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- homedir
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- shortcut
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---
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![](keywords>bash shell scripting expansion substitution tilde home homedir shortcut)
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# Tilde expansion
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~
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~/...
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---
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tags:
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- bash
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- shell
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- scripting
|
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- syntax
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- language
|
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- behaviour
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- executing
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- execution
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---
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FIXME work in progress\...
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# Parsing and execution
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![](keywords>bash shell scripting syntax language behaviour executing execution)
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Nearly everything in [Bash grammar](../../syntax/basicgrammar.md) can be broken
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down to a \"simple command\". The only thing Bash has to expand,
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evaluate and execute is the simple command.
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# Patterns and pattern matching
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---
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tags:
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- bash
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- shell
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- scripting
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- glob
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- globbing
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- wildcards
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- filename
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- pattern
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- matching
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---
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![](keywords>bash shell scripting glob globbing wildcards filename pattern matching)
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# Patterns and pattern matching
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A pattern is a **string description**. Bash uses them in various ways:
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# Parameter expansion
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---
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tags:
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- bash
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- shell
|
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- scripting
|
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- expansion
|
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- substitution
|
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- text
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- variable
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- parameter
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- mangle
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- substitute
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- change
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- check
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- defined
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- "null"
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- array
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- arrays
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---
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![](keywords>bash shell scripting expansion substitution text variable parameter mangle substitute change check defined null array arrays)
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# Parameter expansion
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## Introduction
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# Quotes and escaping
|
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---
|
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tags:
|
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- bash
|
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- shell
|
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- scripting
|
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- quoting
|
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- quotes
|
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- escape
|
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- backslash
|
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- marks
|
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- singlequotes
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- doublequotes
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||||
- single
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- double
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---
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|
||||
![](keywords>bash shell scripting quoting quotes escape backslash marks singlequotes doublequotes single double)
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# Quotes and escaping
|
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|
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Quoting and escaping are important, as they influence the way Bash acts
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upon your input. There are three recognized types:
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# Words\...
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---
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tags:
|
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- bash
|
||||
- shell
|
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- scripting
|
||||
- token
|
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- words
|
||||
- split
|
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- splitting
|
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- recognition
|
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---
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|
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![](keywords>bash shell scripting token words split splitting recognition)
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# Words\...
|
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|
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FIXME This article needs a review, it covers two topics (command line
|
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splitting and word splitting) and mixes both a bit too much. But in
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|
Loading…
Reference in New Issue
Block a user