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The test

if [ -e ${FOLDER}/${PID} ]

does not accept multiple values this way. Putting a set -x in the head of your script shows following:

+ '[' -e...

Referring to post #1 (we'll ignore post #2).
The script contains a fundamental logic error. If there is more than one file matching the pattern *.pid the variable $PID contains multiple values....

can be done with 1 find command


find /home/somefolder/pids -maxdepth 1 -type f -name "*.pid" -amin +40 -exec rm {} \;

Change it to -mmin (as -amin changes also when someone issues a read like cat on it) and xoops solution will be best, if your find supports that switch. :b: Though you might check out the commented...