How to edit crontab

Crontab is a unix background process that schedules other unix jobs. In order to be edited, the admininistrator must set the EDITOR enviromental variable. The steps are:

Change or Set Environment Variable

You can use the following command to change the environment variable for the current session as per your shell.

For Korn shell (KSH)

The syntax is as follows:

 
EDITOR=vi
export EDITOR

For Bourne shell (sh and bash)

The syntax is as follows:

 
export EDITOR=vi
 

or

EDITOR=vi

export EDITOR

 
To set PATH, enter:

 
export PATH=$PATH:/opt/bin:/usr/local/bin:$HOME/bin
 

For C shell (csh or tcsh)

The syntax is as follows:

 
setenv var value
 

Set EDITOR to vim, enter:

 
setenv EDITOR vi 

There are plenty of type editors, the most common are vi, , emacs, joe 

After having set the EDITOR, type the command "crontab -e" to edit crontab 

job scheduler.

To list the cron jobs type "crontab -l"

More information about the enviromental variables in Unix and

how to manipulate them can be found on this article

http://www.cyberciti.biz/faq/set-environment-variable-unix/