Question

52

How can I see/stop current running crontab tasks?

rated 0 times [ 52] [ 0] / answers: 1 / hits: 149576 / 1 Year ago, fri, february 10, 2023, 8:19:29

How can I see crontab tasks which are in progress?

How can I stop crontab tasks which are in progress, manually?

Is [this] question about see the current running cron processes?

Yes

To kill a process manually one way is to use pkill

I had thought about pkill/killall, but some of my commands in crontab file are respectively! it means that after finishing a command, the next one will be started! for example:

sudo crontab -e

00 10 * * * /usr/bin/wget LINK ; shutdown -h now

So, If I kill wget, the computer will be powered off!!! -> I want to kill a cron task fully, not a part of it!

The next pkill problem: What about scripts? (I've imported some bash scripts to crontab -e) --> sudo pkill ???

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

mouedi

Add To Favorites

Follow

Total Points: 420

Total Questions: 109

Total Answers: 116

Location: Philippines

Member since Wed, Aug 19, 2020

4 Years ago

answered 1 Year ago atereress · Accepted Answer

Firstly, use only one command per line in crontab. Change this crontab line:

00 10 * * * /usr/bin/wget LINK ; shutdown -h now

so it looks like:

00 10 * * * /path/to/my/crontab/script1.sh

and create /path/to/my/crontab/script1.sh with this content:

#!/bin/bash

/usr/bin/wget LINK

shutdown -h now

Of course, don't forget to give it execution permission:

chmod +x /path/to/my/crontab/script1.sh

Secondly, you can see running crontab tasks, in a useful and readable format, in the output of:

ps -o pid,sess,cmd afx | egrep -A20 "( |/)cron( -f)?$"

They will appear in the first lines, something like this:

1108  1108 cron

4288  1108 _ CRON

4289  4289     _ /bin/sh -c /path/to/my/crontab/script1.sh

4290  4289         _ /bin/bash /path/to/my/crontab/script1.sh

4295  4289             _ /usr/bin/wget LINK

First column is PID, second is Session ID and third is the command started by cron. You can kill all the processes related to a specific cron task using the Session ID, so in the example above you should kill Session ID 4289:

pkill -s 4289