How to create a cron job and run it ,give simpleexample
 

Hi,
How create a cron job in terminal,
and how to run it.
Please give a simple example

Thanks
Ramakrishnan

A good start would be
http://www.cyberciti.biz/faq/how-do-...-or-unix-oses/

Example
 

Hi Ramakrishnan,

firstly when you want to create/edit your crontab file type the following.

This will open the crontab to edit and will run a check on the cron job for errors when you go to save it.
Here's a simple example.

This line executes the "find" command at 2AM on the 12th of every month that a Sunday or Saturday falls on.

I stole this example from here: please check it out for more...
http://www.pantz.org/software/cron/croninfo.html

Good Luck

Hi,

Assumptions:

Script you want to run: foo.sh
When: daily 12:15

From the terminal:

crontab -e (a editor session is started)

Add: 15 12 * * * /full/path/to/foo.sh

Save and exit editor.

Done.

Look at man 5 crontab for the explanation of the 15 12 * * * (minutes, hours, monthday, month, weekday ) notation.

Hope this helps.

Hi,
Thanks to all
when i type crontab -e on terminal it gives

/var/spool/cron/crontabs/node2: Permission denied

Hi,

You (the user executing the crontab -e command) must have crontab access.

I'm not sure if this is true for all distro's but have a look at /etc/cron.allow, the user should be added there (you need root access to change that file).

Hope this helps.

Oh, just remembered: The user should not be present in /etc/cron.deny.

in my ubuntu
/etc/cron.allow is not found
and also when type sudo su in terminal
it shows
sudo: must be setuid root
and i can't install new packages why?

Hi,

I'm not an Ubuntu user, but it looks like something was not installed correctly (the setuid thingy). Maybe an Ubuntu user can help you with that one.

You can create the /etc/cron.allow yourself (as root). It expects one user per line.

Hope this helps.

How to create it druuna?

Hi,

From the terminal, as root user:

vi /etc/cron.allow

Once it opens press i (for insert) and type the username that needs cron access.
Press esc (escsape, you will taken out of insertion mode)
Press: :wq this will write (w) the file and quit (q), don't forget the leading :

Last thing to do is to change the permissions of this file:
chmod 600 /etc/deny.allow

You can cat the file to see if it is ok: cat /etc/cron.allow. You should see the user that was added.

Hope this helps.

Actually

:wg

should be

:wq

although it's quicker to do

:x

you'd need to be root to edit cron.allow or cron.deny.
In Ubuntu you should be able to do something like

sudo su -

to become root. If that doesn't work, show us the err msgs you get.

/rant
I REALLY hate the way Ubuntu has messed with the std sudo & su setup that the rest of the *nix world has always used!
end_rant/

Hi,
When i type vi/etc/cron.allow
result is
bash: vi/etc/cron.allow: No such file or directory

You missed the space between the cmd and the param

vi /etc/cron.allow


http://rute.2038bug.com/index.html.gz

Hi,
when i type vi /etc/cron.allow
and pressed i
then typed root
then esc pressed then i typed :wq
then esc
it shows
"/etc/cron.allow"
"/etc/cron.allow" E212: Can't open file for writing
why

Hi,

2 things:

1) You don't need to put the root user in the cron.allow file, root is all powerful. I initially thought you were talking about a normal user.

2) Another way of putting the username into /etc/cron.allow (as root):
echo "username" >> /etc/cron.allow

After that, just in case:
chmod 600 /etc/cron.allow

Hope this helps.