Chad Carr wrote:
Shell gurus,
Is there a reliable cross-platform way to write an inverted if statement? Something like bash's:
if ! /usr/bin/false # with some other command, obviously then # do something true else # do something false fi
Your assistance is greatly appreciated.
Just shuffle the "then" and "else" code around as appropriate for the sense of the exit condition you're checking for.
If that's not an option (ie: you're only checking one case, and don't want an empty "then"), you can do something like
if /usr/bin/false ; [ $? -ne 0 ] ; then
...or more typically:
/usr/bin/false
if [ $? -ne 0 ] ; then
...or even:
/usr/bin/false
retcode=$?
...
if [ $retcode -ne 0 ] ; then
...If you're just trying to test for error codes or something, the following might be handy:
abort() { ... }# Call an abort procedure if command1 fails /usr/bin/command1 || abort
# Run several commands if command2 fails
/usr/bin/command2 || { echo "ERROR!!!" ; exit ; }HTH
-- Charles Steinkuehler [EMAIL PROTECTED]
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