292 lines
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292 lines
16 KiB
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<ol class="chapter"><li class="chapter-item expanded "><a href="The-Z-Shell-Manual.html"><strong aria-hidden="true">1.</strong> The Z Shell Manual</a></li><li class="chapter-item expanded "><a href="Introduction.html"><strong aria-hidden="true">2.</strong> Introduction</a></li><li class="chapter-item expanded "><a href="Roadmap.html"><strong aria-hidden="true">3.</strong> Roadmap</a></li><li class="chapter-item expanded "><a href="Invocation.html"><strong aria-hidden="true">4.</strong> Invocation</a></li><li class="chapter-item expanded "><a href="Files.html"><strong aria-hidden="true">5.</strong> Files</a></li><li class="chapter-item expanded "><a href="Shell-Grammar.html"><strong aria-hidden="true">6.</strong> Shell Grammar</a></li><li class="chapter-item expanded "><a href="Redirection.html"><strong aria-hidden="true">7.</strong> Redirection</a></li><li class="chapter-item expanded "><a href="Command-Execution.html" class="active"><strong aria-hidden="true">8.</strong> Command Execution</a></li><li class="chapter-item expanded "><a href="Functions.html"><strong aria-hidden="true">9.</strong> Functions</a></li><li class="chapter-item expanded "><a href="Jobs-_0026-Signals.html"><strong aria-hidden="true">10.</strong> Jobs & Signals</a></li><li class="chapter-item expanded "><a href="Arithmetic-Evaluation.html"><strong aria-hidden="true">11.</strong> Arithmetic Evaluation</a></li><li class="chapter-item expanded "><a href="Conditional-Expressions.html"><strong aria-hidden="true">12.</strong> Conditional Expressions</a></li><li class="chapter-item expanded "><a href="Prompt-Expansion.html"><strong aria-hidden="true">13.</strong> Prompt Expansion</a></li><li class="chapter-item expanded "><a href="Expansion.html"><strong aria-hidden="true">14.</strong> Expansion</a></li><li class="chapter-item expanded "><a href="Parameters.html"><strong aria-hidden="true">15.</strong> Parameters</a></li><li class="chapter-item expanded "><a href="Options.html"><strong aria-hidden="true">16.</strong> Options</a></li><li class="chapter-item expanded "><a href="Shell-Builtin-Commands.html"><strong aria-hidden="true">17.</strong> Shell Builtin Commands</a></li><li class="chapter-item expanded "><a href="Zsh-Line-Editor.html"><strong aria-hidden="true">18.</strong> Zsh Line Editor</a></li><li class="chapter-item expanded "><a href="Completion-Widgets.html"><strong aria-hidden="true">19.</strong> Completion Widgets</a></li><li class="chapter-item expanded "><a href="Completion-System.html"><strong aria-hidden="true">20.</strong> Completion System</a></li><li class="chapter-item expanded "><a href="Completion-Using-compctl.html"><strong aria-hidden="true">21.</strong> Completion Using compctl</a></li><li class="chapter-item expanded "><a href="Zsh-Modules.html"><strong aria-hidden="true">22.</strong> Zsh Modules</a></li><li class="chapter-item expanded "><a href="Calendar-Function-System.html"><strong aria-hidden="true">23.</strong> Calendar Function System</a></li><li class="chapter-item expanded "><a href="TCP-Function-System.html"><strong aria-hidden="true">24.</strong> TCP Function System</a></li><li class="chapter-item expanded "><a href="Zftp-Function-System.html"><strong aria-hidden="true">25.</strong> Zftp Function System</a></li><li class="chapter-item expanded "><a href="User-Contributions.html"><strong aria-hidden="true">26.</strong> User Contributions</a></li></ol>
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<main>
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<!-- START doctoc generated TOC please keep comment here to allow auto update -->
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<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
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<p><strong>Table of Contents</strong> <em>generated with <a href="https://github.com/thlorenz/doctoc">DocToc</a></em></p>
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<ul>
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<li><a href="#8-command-execution">8 Command Execution</a></li>
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</ul>
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<!-- END doctoc generated TOC please keep comment here to allow auto update -->
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<p><span id="Command-Execution"></span>
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<span id="Command-Execution-1"></span></p>
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<h1 id="8-command-execution"><a class="header" href="#8-command-execution">8 Command Execution</a></h1>
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<p><span id="index-command-execution"></span>
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<span id="index-execution_002c-of-commands"></span>
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<span id="index-command-not-found_002c-handling-of"></span>
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<span id="index-command_005fnot_005ffound_005fhandler"></span></p>
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<p>If a command name contains no slashes, the shell attempts to locate it.
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If there exists a shell function by that name, the function is invoked
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as described in <a href="Functions.html#Functions">Functions</a>. If there exists a
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shell builtin by that name, the builtin is invoked.</p>
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<p><span id="index-path_002c-use-of"></span></p>
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<p>Otherwise, the shell searches each element of <code>$path</code> for a search is
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unsuccessful, the shell prints an error message and returns a nonzero
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exit status.</p>
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<p>and the file is not a directory, it is assumed to be a shell script.
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<code>/bin/sh</code> is spawned to execute it. If the program is a file beginning
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with ‘<code>#!</code>’, the remainder of the first line specifies an interpreter
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for the program. The shell will execute the specified interpreter on
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operating systems that do</p>
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<p>If no external command is found but a function
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<code>command_not_found_handler</code> exists the shell executes this function with
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all command line arguments. The return status of the function becomes
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the status of the command. If the function wishes to mimic the behaviour
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of the shell when the command is not found, it should print the message
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‘<code>command not found:</code> <code>cmd</code>’ to standard error and return status 127.
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Note that the handler is executed in a subshell forked to execute an
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external command, hence changes to directories, shell parameters, etc.
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have no effect on the main shell.</p>
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<hr />
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<p>This document was generated on <em>February 15, 2020</em> using
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<a href="http://www.nongnu.org/texi2html/"><em>texi2html 5.0</em></a>.<br />
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Zsh version 5.8, released on February 14, 2020.</p>
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