I want to schedule a shell(.sh) script. Please tell me the command or procedure.

"at" is good for one-time scheduling, "cron" is good for regular scheduling.

To see what crontabs are currently running on your system, you can open a terminal and run:

sudo crontab -l

To edit the list of cronjobs you can run:

sudo crontab -e

ex:
* * * * * /bin/execute/this/script.sh

As you can see there are 5 stars. The stars represent different date parts in the following order:

minute (from 0 to 59)
hour (from 0 to 23)
day of month (from 1 to 31)
month (from 1 to 12)
day of week (from 0 to 6) (0=Sunday)

one addition to vukomir's response: each user has a crontab. so, doing
sudo crontab -l
will show you root's crontab. you can also have your own crontab if you want.

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Hi, thank you very much to all of you for you helping hands, however, now there is a problem is case of ftp command, it is not working i.e. I want to backup(copy) my Oracle .dmp files from my Sun Solaris Server to RHEL Server I wrote the following codes in a .sh file:

ftp 192.9.1.33
backup
backup
cd /data3/export/hpcl
lcd /data3/Bropts_dbk
prompt
bin
hash
mget *.dmp
bye
exit 0

and I want to schedule my backup. How is it possible!!!!

Regards

Well, those 'codes' aren't going to work. Have you tried to run that from a command-line first??? Unless your script can work from the command line, it won't work through cron. So fix that first..a hint, here: look at expect, since your script (as written above) will fail on line 2, because as soon as it forks into the FTP command, processing of the SHELL SCRIPT will stop. So, your user ID/password won't get written, other commands won't work, etc. Expect can automate this task, but again, test the script from the command line first.

Aside from that, read the man page on cron/crontab, and you can see how to automate a script easily. Google has lots of examples, if you look:
http://www.pantz.org/software/cron/croninfo.html

On an related note...FTP isn't the best tool to use for the job anymore. SCP or SFTP are more secure, and support key-exchange logins, meaning you don't need to supply a password, which makes things easy to script.

Well you are right, it is failing in command line. Can you give me an example of SFTP command for transferring my data from one server to other, as shown in my ftp code you can understand what I wanted to do. So please help me as I am not familiar with SFTP.

Then the best thing you can do is to read the man page for it, since it'll explain how to use it.

A simple command-line is
but again, SCP is also an option, and easier to script for:
If you have your keys swapped, you won't need to put in a password, and this will easily run automatically. One catch is that you will need to either run this in a USER crontab (not roots), or specify a users identification on the command line, if you do run it under root's crontab.