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while
Execute consequent-commands as long as test-commands
has an exit status of zero
SYNTAX
while test-commands; do consequent-commands; done
The return status is the exit status of the last command executed
in consequent-commands, or zero if none were executed.
Related commands:
case - Conditionally perform a command
for - Expand words, and execute commands
if - Conditionally perform a command
until - Execute commands (until error)