2005-09-20 21:31:55 +08:00
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\section while while - perform a command multiple times
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\subsection while-synopsis Synopsis
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2006-09-19 22:52:03 +08:00
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<tt>while CONDITION; COMMANDS...; end</tt>
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2005-09-20 21:31:55 +08:00
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2006-10-31 23:23:16 +08:00
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\subsection while-description Description
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2006-09-19 22:52:03 +08:00
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The <tt>while</tt> builtin causes fish to continually execute CONDITION and
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execute COMMANDS as long as CONDITION returned with status 0. If CONDITION is
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false on the first time, COMMANDS will not be executed at all. Hints: use
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<a href="#begin"><tt>begin; ...; end</tt></a> for complex conditions; more
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complex control can be achieved with <tt>while true</tt> containing a
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<a href="#break">break</a>.
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2005-09-20 21:31:55 +08:00
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\subsection while-example Example
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<tt>while test -f foo.txt; echo file exists; sleep 10; end</tt>
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2006-09-19 22:52:03 +08:00
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causes fish to print the line 'file exists' at 10 second intervals as long as
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the file foo.txt exists.
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