List crontabs (cron entries) for all linux users

We had a problem with Plesk, allowing a hacker to set up cron processes on our Linux server as various users. After cleaning a few up, I used this command to list the cron tables for all users:

It’s a handy command to keep in your toolbox.

What it does, is take the first field – the username – from the passwd file, then pass each username to the crontab command to list the table. xargs is used to pass the usernames one at a time, since crontab only accepts one username.

 
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