mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-11-27 11:43:37 +08:00
23 lines
887 B
Plaintext
23 lines
887 B
Plaintext
\section while while - perform a command multiple times
|
|
|
|
\subsection while-synopsis Synopsis
|
|
\fish{synopsis}
|
|
while CONDITION; COMMANDS...; end
|
|
\endfish
|
|
|
|
\subsection while-description Description
|
|
|
|
`while` repeatedly executes `CONDITION`, and if the exit status is 0, then executes `COMMANDS`.
|
|
|
|
The exit status of the while loop is the exit status of the last iteration of the `COMMANDS` executed,
|
|
or 0 if none were executed. (This matches other shells and is POSIX-compatible.)
|
|
|
|
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>.
|
|
|
|
\subsection while-example Example
|
|
|
|
\fish
|
|
while test -f foo.txt; or test -f bar.txt ; echo file exists; sleep 10; end
|
|
# outputs 'file exists' at 10 second intervals as long as the file foo.txt or bar.txt exists.
|
|
\endfish
|