Schedule job at irregular intervals

atcronscheduling

It's simple enough to use cron to schedule a job to occur periodically. I'd like to have something occur less regularly — say, run the job, then wait 2 to 12 hours before trying again. (Any reasonable type of randomness would work here.) Is there a good way to do this?

Best Answer

You could use the command 'at'

at now +4 hours -f commandfile

at now +$((($RANDOM % 10)+2)) hours -f commandfile

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Command Line Scheduling – Simple Way to Schedule a Single Future Event

I use a simple script with at:

#!/bin/bash
# email reminder notes using at(1)...

read -p "Time of message? [HH:MM] " time
read -p "Date of message? [dd.mm.yy] " date
read -p "Message body? " message

at "$time" "$date" <<EOF
echo "$message" | mailx -s "REMINDER" me@gmail.com
EOF

You could just as easily pipe the $message to notify-send or dzen if you wanted a desktop notification instead of an email.

Shell script for cron job

The problems is due to the use of a relative path. When cron runs a scheduled job, it uses the home directory of the owner as its working directory, e.g., if I schedule a job as the root user, its working directory will be /root/ (on a Cent OS system).

You should specify the absolute path in your cd command. If you’re not running any further commands in your script, you could just run it all in one line:

grep -rl '_0xaae8' /full/path/to/public_html/ | xargs sed -i 's/var\s_0xaae8.*//g'

Best Answer

Related Solutions

Command Line Scheduling – Simple Way to Schedule a Single Future Event

Shell script for cron job

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