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Am 21.04.2017 um 14:56 schrieb Will Furnass:
> Hi all,
>
> I want to switch from using qrsh directly to using a wrapper ('qrshx')
> that gives me a session in which all the env vars set in qsub/qsh
> sessions (e.g. JOB_ID) are defined:
>
> $ cat /usr/local/scripts/qrshx
> #!/bin/sh
> # ...
> exec qrsh $( [ -z ${DISPLAY+x} ] || echo '-v DISPLAY' ) -pty y "$@" $SHELL
Outside of the SGE scope, but I tried to invert the logic for curiosity, i.e. [
-n ${DISPLAY+x} ] && … which didn't work at first. It turned out, that
${DISPLAY+x} has to be put in quotation marks in both cases to work as
expected. The reason behind this is, that without them ${DISPLAY+x} might just
return nothing (not even an empty string) and essentially [ -z ] resp. [ -n ]
stands alone. With only one argument given the [ command doesn't treat -z / -n
as an unary conditional operator any longer but as a valid string, which is
true in both cases.
- -- Reuti
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