I want to be able to programatically add a new cron job, what is the best way to do this?
From my research, it seems I could dump the current crontab and then append a new one, piping that back into crontab:
(crontab -l ; echo "0 * * * * wget -O - -q http://www.example.com/cron.php") | crontab -
Is there a better way?
The best way if you're running as root, is to drop a file into /etc/cron.d
if you use a package manager to package your software, you can simply lay down files in that directory and they are interpreted as if they were crontabs, but with an extra field for the username, e.g.:
Filename: /etc/cron.d/per_minute
Content:
* * * * * root /bin/sh /home/root/script.sh
Most of the solutions here are for adding lines to the crontab. If you need more control, you'll want to be able to control the entire contents of the crontab.
You can use piping to do this pretty elegantly.
To completely rewrite the crontab, do
echo "2 2 2 2 2 /bin/echo foobar" |crontab -
This should be easy to combine with other answers described here like
crontab -l | <something> | tee |crontab -
Or, if you have the contents in a file, it is even simpler
cat <file> |crontab -
If you're planning on doing it for a run-once scenario for just wget'ing something, take a look at 'at'
Assuming that there is already an entry in your crontab, the following command should work relatively well. Note that the $CMD variable is only there for readability. Sorting before filtering duplicates is important, because uniq only works on adjacent lines.
CMD='wget -O - -q http://www.example.com/cron.php"'
(crontab -l ; echo "0 * * * * $CMD") | sort | uniq | crontab -
If you currently have an empty crontab, you will receive the following error to stderr:
no crontab for user
If you want to avoid this, you can add a little bit of complexity add do something like this:
(crontab -l ; echo "0 * * * * $CMD") 2>&1 | sed "s/no crontab for $(whoami)//" | sort | uniq | crontab -
Here's another one-liner way, that avoids duplicates
(crontab -l 2>/dev/null | fgrep -v "*/1 * * * * your_command"; echo "*/1 * * * * your_command") | crontab -
And here's a way to do JohnZ's answer and avoid no crontab for user message, or if you need to operate in a set -eu type environment and can't have anything return a failure (in which case the 2>/dev/null part is optional):
( (crontab -l 2>/dev/null || echo "") ; echo "0 * * * * your_command") | sort -u - | crontab -
Or if you want to split things up so that they're more readable:
new_job="0 * * * * your_command"
preceding_cron_jobs=$(crontab -l || echo "")
(echo "$preceding_cron_jobs" ; echo "$new_job") | sort - | uniq - | crontab -
Or optionally remove any references to your_command (ex: if the schedule has changed, you only want it ever cron'ed once). In this case we no longer need uniq (added bonus, insertion order is also preserved):
new_job="0 * * * * your_command"
preceding_cron_jobs=$(crontab -l || echo "")
preceding_cron_jobs=$(echo "$preceding_cron_jobs" | grep -v your_command )
(echo "$preceding_cron_jobs" ; echo "$new_job") | crontab -
function cronjob_exists($command){
$cronjob_exists=false;
exec('crontab -l', $crontab);
if(isset($crontab)&&is_array($crontab)){
$crontab = array_flip($crontab);
if(isset($crontab[$command])){
$cronjob_exists=true;
}
}
return $cronjob_exists;
}
function append_cronjob($command){
if(is_string($command)&&!empty($command)&&cronjob_exists($command)===FALSE){
//add job to crontab
exec('echo -e "`crontab -l`\n'.$command.'" | crontab -', $output);
}
return $output;
}
append_cronjob('* * * * * curl -s http://localhost/cron/test.php');
If you want the task to run as a user:
crontab -l | { cat; echo "@weekly what_you_want_to_execute"; } | crontab -
If you want the task to run with privileges:
sudo crontab -l | { cat; echo "@weekly what_you_want_to_execute"; } | sudo crontab -
and check task (with or without 'sudo'):
crontab -l | sed '/^$/d; /#/d'
Below is what I use in my script
1.
(2>/dev/null crontab -l ; echo "0 3 * * * /usr/local/bin/certbot-auto renew") | crontab -
cat <(crontab -l 2>/dev/null) <(echo "0 3 * * * /usr/local/bin/certbot-auto renew") | crontab -
#write out current crontab
crontab -l > mycron 2>/dev/null
#echo new cron into cron file
echo "0 3 * * * /usr/local/bin/certbot-auto renew" >> mycron
#install new cron file
crontab mycron
rm mycron
To have flexibility when changing the command in the future you can do this (works best with an update script)
MARK=SOME_UNIQUE_MARK_TEXT
LINE="This is the command # $MARK"
# NOTE: I'm using -e because I might want to avoid weird bash expansions for '*' or '$' and place:
# \x2A instead of *
# \x24 instead of $
( crontab -l | grep -v $MARK ; echo -e "0 * * * *" $LINE ) | crontab -
In this way I can update an old crontab command which no longer serves current purpose.
Basically I get the current crontab, I eliminate the line containing the MARK (grep -v) and replace it with the new one by appending it at the end of the crontab file via echo -e. In this particular case I want it executed every hour at minute 0 0 * * * * as it can be seen from here.
It's always worked well for me.
You should consider a slightly more sophisticated script that can do three things.
Append a crontab line; assuring that it didn't exist. Adding when it already exists is bad.
Remove the crontab line. Perhaps only warning if it didn't exist.
A combination of the above two features to replace the crontab line.
