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Top Forums Shell Programming and Scripting Need to know why crontab -e fails Post 302987567 by MadeInGermany on Tuesday 13th of December 2016 12:03:39 PM
Old 12-13-2016
grep out the existing entries!
For example grep out all the exact entries
Code:
(crontab -l | fgrep -vxf cron.txt; cat cron.txt) | crontab

---------- Post updated at 12:03 ---------- Previous update was at 12:02 ----------

If you want to regularly check for update, it is advisable to only replace the crontab if a change happens.
Code:
addto=$(
crontab -l | nawk 'FILENAME=="-" {A[$0]; next} !($0 in A)' - cron.txt
)
if [ -n "$addto" ]
then
  (crontab -l; echo "$addto") | crontab
fi

In theory you can also do a process substitution
Code:
addto=$(
fgrep -vxf <(crontab -l) cron.txt
)

but I have seen temporary malfunction in Solaris.
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