On 2017-07-14 11:07, Kaz Kylheku wrote: > On 12.07.2017 08:35, Bryan Dunphy wrote: >> I have a shell script, originally created for Mac OS X. that waits for >> an external drive to be mounted (by testing an “ls” of the volume’s >> root directory for success) then runs an “rsync” >> command. How do I get the script to be run repeatedly until >> successful exit under Cygwin? > Multi-line > while ! program arg1 arg2 ... > do > : # explicit null statement: syntactically mandatory! > done > one-liner: semicolon between program and "do", > semicolon between : statement and "done": > while ! program arg1 arg2 ... ; do : ; done > The space between ! and the command is required. > I would throw a sleep in there, not to create a CPU-intensive > busy loop: > while ! program args ... ; do > sleep 1 > done
Has everyone forgotten there is also an until loop, supported by at least sh, dash, bash, [m]ksh: until prog ...; do sleep 60; done -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple