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When I execute cron I get this fault

cron: can't open or create /var/run/crond.pid: Permission denied

So, how to do it without cron?

P.S. I want to check if file in svn has changed and I have a special script for it.

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If you do not have permission, then try run cron with sudo. –  Anonymous Nov 25 '11 at 18:22
2  
Bear in mind cron won't do something every 10 seconds, the most granular it gets is once a minute. –  Caesium Nov 25 '11 at 19:07
    
If you want to make cronjobs, you've to run crontab -e to start the editor. To list the current crons, run crontab -l –  Lekensteyn Nov 25 '11 at 21:09
    
@Anonymous i don't know root password, so sudo won't help me. –  UAdapter Nov 26 '11 at 14:00
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3 Answers

up vote 12 down vote accepted

To access your personal cron configuration you should use the command crontab -e (to edit your cron table).

Alternative is the watch command:

watch -n10 command args

Finally, to monitor filesystem events more effectively, you could use inotifywait, from inotify-tools package.

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You can write a shell script that has sleep in a while loop.

#!/bin/sh
while [ true ]
do
    sh special_svn_script.sh
    sleep 10
done
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while true does not require square brakets, otherwise "true" is interpreted as a string, and every string is as good as "true". –  enzotib Nov 25 '11 at 19:16
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gnome-schedule Install gnome-schedule is a graphical user interface that leverages the power of vixie-cron, dcron and at to manage your crontab file and provide an easy way to schedule tasks on your computer. It supports recurrent (periodical) tasks and tasks that happen only once in the future. It is written in Python using pygtk.

Awesome features

Supports custom titles and icons for your tasks so that they are more easily to keep track of
Templates support so that you won't have to create the same task again and again; these are saved in gconf and may easily ship them with, say, a Linux distribution
If run as root, you can edit any user's crontab and "at" tasks.
Human-readable strings like "Every hour" instead of "0 * * * *"
Advanced mode for crontab experts
Provides a "panel applet" where you can manage tasks from a dropdown menu
Predefined common expressions like: every minute, every week, tomorrow, next week
A calendar allows you to choose the day you want a task executed
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