Brian: > > A=$(lsusb | grep -i 'Stylus Color 740') > if [ -z "$A" ]; then > systemctl stop cups.service cups.socket cups.path > fi > > (No sniggering at the back, please. I'm aware of the deficiencies in the > logic. Improvements are welcome).
I would have phrased it something like this:
if ! lsusb | grep -qi 'Stylus Color 740'; then
systemctl stop cups.service cups.socket cups.path
fi
grep exits with > 0 if it doesn't find your pattern. In this case you
can use -q to prevent grep from printing matching lines on stdout.
Ugly one-liner:
lsusb | grep -qi 'Stylus Color 740' || systemctl stop cups.service cups.socket
cups.path
"EITHER grep finds something OR I want to shut down Cups."
J.
--
I have been manipulated and permanently distorted.
[Agree] [Disagree]
<http://www.slowlydownward.com/NODATA/data_enter2.html>
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