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UGU: Unix Guru Universe - Unix Tip #4516- July 23, 2023
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Unix Tip #4516- July 23, 2023
ACCIDENTS WITH CRONTAB
Ever typed the crontab
command and forgot
the -l option?
That's kinda dangerous,
for if you hit ctrl-D
to get back to the
prompt, your crontab's
gone.
To prevent this, make a
script with the following
contents:
#!/bin/ksh
if [[ $# -eq 0 ]] ; then
echo "crontab: no option specified. Aborted."
exit 2
else
/usr/bin/crontab "$@"
fi
Make sure the script is
executable and put it in
a directory that's in your
PATH BEFORE the /usr/bin
directory.
Now if you type crontab
without option or filename,
you'll just get an error
message. If you want to pipe
some stuff to crontab, you
still can do it like this:
% somecommand | crontab -
This tip generously supported by: kees.couprie+ugu@swift.com
NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted
by various unix admins around the globe. UGU suggest you read and
test each tip in a non-volitile environment before placing into
production.
LAST 5 TIPS
4515
- ROTATE THE ALPHABET
4514
- RECREATING DIRECTORY TREES
4513
- DID IT REBOOT?
4512
- TERMINAL RESET
4511
- RENICE CPU HOGS
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