Interactive or not

[PJJ]

Hi all,
I need to change my DISPLAY settings, so I try to figure out if my script runs interactive or from cron. Therefore I'm trying to run the script example from thread 63219, but it gives errors.
Any help is appreciated!

#!/usr/bin/sh
[ -t 0 ] && print -u2 "stdin is interactive"
[ -t 1 ] && print -u2 "stdout is interactive"
[ -t 0 ] || print -u2 "stdin is NOT interactive"
[ -t 1 ] || print -u2 "stdout is NOT interactive"
exit 0

./my.sh
./my.sh[2]: Syntax error at line 2 : `&' is not expected.

[James R. Ferguson]

Hi:

Simply test this way:

if [ -t 0 ]; then
echo "I'm running interactively"
else
echo "I am not associated with a tty!"
fi

Regards!

...JRF...

[spex]

Schrikbeeld,

Did you actually copy and paste the script containing "[" and "]", or did you substitute "[" and "]" (left and right brackets) for these character codes?

The script should read:

#!/usr/bin/sh
[ -t 0 ] && print -u2 "stdin is interactive"
[ -t 1 ] && print -u2 "stdout is interactive"
[ -t 0 ] || print -u2 "stdin is NOT interactive"
[ -t 1 ] || print -u2 "stdout is NOT interactive"
exit 0

PCS

[PJJ]

Then it returns
I am not associated with a tty!

[PJJ]

Spex, I litteraly copy/pasted the &#... syntax.

[spex]

Since there is no tty, it is running non-interactively.

[spex]

So in your script,

if [ -t 0 ]; then
# script running from command line



else
# script run by cron



fi
exit 0

PCS

[PJJ]

Ok, as i understand the &# syntax is to be replaced by [ and ] respectively.
I'm getting it. Thanks for the quick replies!