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bash-hackers-wiki/docs/syntax/ccmd/while_loop.md

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# The while-loop
## Synopsis
while <LIST1> ; do
<LIST2>
done
## Description
The while-loop is relatively simple in what it does: it executes the
Fix hyperlinks of markdown pages at depth 3 find docs/ -depth 3 -name '*.md' | xargs grep '(.*/' -l | \ xargs -I{} \ sed -i '' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)\(.md\)\{0\})%(../../\1/\2.md)%g' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)#\([a-zA-Z_-][0-9a-zA-Z_-]*\))%(../../\1/\2.md#\3)%g' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)\(.md\)\{0\})%(../../\1/\2/\3.md)%g' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)#\([a-zA-Z_-][0-9a-zA-Z_-]*\))%(../../\1/\2/\3.md#\4)%g' \ -e 's%](\([^:.>)#][^:.>)#]*\))%](../../\1.md)%g' \ -e 's%](\([^:.>)#][^:.>)#]*\)#\([^:.>)#][^:.>)#]*\))%](../../\1.md#\2)%g' \ {} Related to https://github.com/flokoe/bash-hackers-wiki/issues/10
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[command list](../../syntax/basicgrammar.md#lists) `<LIST1>` and if the exit
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code of it was 0 (TRUE) it executes `<LIST2>`. This happens again and
again until `<LIST1>` returns FALSE.
This is exactly the opposite of the [until
Fix hyperlinks of markdown pages at depth 3 find docs/ -depth 3 -name '*.md' | xargs grep '(.*/' -l | \ xargs -I{} \ sed -i '' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)\(.md\)\{0\})%(../../\1/\2.md)%g' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)#\([a-zA-Z_-][0-9a-zA-Z_-]*\))%(../../\1/\2.md#\3)%g' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)\(.md\)\{0\})%(../../\1/\2/\3.md)%g' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)#\([a-zA-Z_-][0-9a-zA-Z_-]*\))%(../../\1/\2/\3.md#\4)%g' \ -e 's%](\([^:.>)#][^:.>)#]*\))%](../../\1.md)%g' \ -e 's%](\([^:.>)#][^:.>)#]*\)#\([^:.>)#][^:.>)#]*\))%](../../\1.md#\2)%g' \ {} Related to https://github.com/flokoe/bash-hackers-wiki/issues/10
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loop](../../syntax/ccmd/until_loop.md).
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:!: Like all loops (both `for`-loops, `while` and `until`), this loop
can be
- terminated (broken) by the `break` command, optionally as `break N`
to break `N` levels of nested loops
- forced to immediately do the next iteration using the `continue`
command, optionally as `continue N` analog to `break N`
### Return status
The return status is the one of the last command executed in `<LIST2>`,
or `0` (`TRUE`) if none was executed.
## Examples
## Portability considerations
## See also
Fix hyperlinks of markdown pages at depth 3 find docs/ -depth 3 -name '*.md' | xargs grep '(.*/' -l | \ xargs -I{} \ sed -i '' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)\(.md\)\{0\})%(../../\1/\2.md)%g' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)#\([a-zA-Z_-][0-9a-zA-Z_-]*\))%(../../\1/\2.md#\3)%g' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)\(.md\)\{0\})%(../../\1/\2/\3.md)%g' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)#\([a-zA-Z_-][0-9a-zA-Z_-]*\))%(../../\1/\2/\3.md#\4)%g' \ -e 's%](\([^:.>)#][^:.>)#]*\))%](../../\1.md)%g' \ -e 's%](\([^:.>)#][^:.>)#]*\)#\([^:.>)#][^:.>)#]*\))%](../../\1.md#\2)%g' \ {} Related to https://github.com/flokoe/bash-hackers-wiki/issues/10
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- Internal: [The until loop](../../syntax/ccmd/until_loop.md)
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- Internal: [code examples of the read builtin
Fix hyperlinks of markdown pages at depth 3 find docs/ -depth 3 -name '*.md' | xargs grep '(.*/' -l | \ xargs -I{} \ sed -i '' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)\(.md\)\{0\})%(../../\1/\2.md)%g' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)#\([a-zA-Z_-][0-9a-zA-Z_-]*\))%(../../\1/\2.md#\3)%g' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)\(.md\)\{0\})%(../../\1/\2/\3.md)%g' \ -e 's%(/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)/\([^/#).][^/#).]*\)#\([a-zA-Z_-][0-9a-zA-Z_-]*\))%(../../\1/\2/\3.md#\4)%g' \ -e 's%](\([^:.>)#][^:.>)#]*\))%](../../\1.md)%g' \ -e 's%](\([^:.>)#][^:.>)#]*\)#\([^:.>)#][^:.>)#]*\))%](../../\1.md#\2)%g' \ {} Related to https://github.com/flokoe/bash-hackers-wiki/issues/10
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command](../../commands/builtin/read.md#code_examples) to see how you can
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loop over lines
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