Keep bash script while loop conditional from printing to console

Question

The following successfully prevents my cacti backup script from running while data is being updated, but I would prefer it if the conditional "ps -C php -f | grep poller" wasn't continuously printing to the console. How can I accomplish this?

#wait till cron job done running:
while  ps -C php -f  | grep poller
do
sleep 1
done
echo "Cron job done. Starting backup"

This does not "print to console". It prints to stdout. Do not conflate the two. — William Pursell, Oct 09 '19 at 21:24

score 0 · Accepted Answer · answered Oct 09 '19 at 21:21

0

use the -q option to grep so it doesn't print the output

while ps -C php -f | grep -q poller

answered Oct 09 '19 at 21:21

Barmar

669,327
51
454
560

That did it. The print stream stopped but it still passed data to the "while" function. – Dustin Soodak Oct 09 '19 at 22:19

Keep bash script while loop conditional from printing to console

1 Answers1