Darryl L. Pierce wrote: > On Fri, Jun 24, 2011 at 09:18:14AM -0500, Chris Adams wrote: >> Once upon a time, Darryl L. Pierce<dpie...@redhat.com> said: >>> (mcpierce@mcpierce-laptop:~)$ pm-is-supported --suspend >>> (mcpierce@mcpierce-laptop:~)$ echo $? >>> 0 >>> (mcpierce@mcpierce-laptop:~)$ pm-is-supported --hibernate >>> (mcpierce@mcpierce-laptop:~)$ echo $? >>> 0 >>> (mcpierce@mcpierce-laptop:~)$ pm-is-supported --suspend-hybrid >>> (mcpierce@mcpierce-laptop:~)$ echo $? >>> 1 >>> >>> Though I'm questioning this last once since I tried to do: >>> >>> pm-is-supported --suspend-hybrid&& echo $? >>> >>> and it never showed the RC, telling me the command itself failed. >> >> Remember: exit code of zero is "success", non-zero is "failure". It is >> inverted from common usage, but allows for multiple "failure" exit >> codes. > > Right. The manpage for pm-is-supported says that a 0 exit code means the > feature _is_ supported, and 1 means it's _not_ supported. So in the > above case suspend and hibernate are (in theory) supported, yet both > result in my laptop being non-responsive. And in the last case the fact > that: > > pm-is-supported --suspend-hybrid&& echo $? > > fails to output the exit code tells me the arg is causing > pm-is-supported itself to fail. > You have asked it to display the termination code if it terminates normally. Is that what you want? I would think you want to display it when it fails, maybe: pm-is-supported --suspend-hybrid && echo Supported || echo "Not supported $?"
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