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24 lines
929 B
Text
24 lines
929 B
Text
\section while while - perform a command multiple times
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\subsection while-synopsis Synopsis
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\fish{synopsis}
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while CONDITION; COMMANDS...; end
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\endfish
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\subsection while-description Description
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`while` repeatedly executes `CONDITION`, and if the exit status is 0, then executes `COMMANDS`.
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If the exit status of `CONDITION` is non-zero on the first iteration, `COMMANDS` will not be
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executed at all, and the exit status of the loop set to the exit status of `CONDITION`.
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The exit status of the loop is 0 otherwise.
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You can use <a href="#and">`and`</a> or <a href="#or">`or`</a> for complex conditions. Even more complex control can be achieved with `while true` containing a <a href="#break">break</a>.
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\subsection while-example Example
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\fish
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while test -f foo.txt; or test -f bar.txt ; echo file exists; sleep 10; end
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# outputs 'file exists' at 10 second intervals as long as the file foo.txt or bar.txt exists.
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\endfish
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