mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-12-12 16:53:37 +08:00
22 lines
756 B
Plaintext
22 lines
756 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`.
|
|
|
|
If the exit status of `CONDITION` is non-zero on the first iteration, `COMMANDS` will not be executed at all.
|
|
|
|
Use <a href="#begin">`begin; ...; end`</a> for complex conditions; 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; echo file exists; sleep 10; end
|
|
# outputs 'file exists' at 10 second intervals as long as the file foo.txt exists.
|
|
\endfish |