How to create an Automatic Task

I have linux/redhat/apache server and all my stuff is written in php
how can i create an automatic task, for example i have a code
that sends reports to customers.
I want this code to be launched lets say every Monday at 10am.

where can i create this schedule?
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use crontab
to add a task lets say a script called /usr/local/bin/do_something

open crontab by using

crontab -e

to add a task

00 2 * * * /usr/local/bin/do_something

# .---------------- minute (0 - 59)
# |  .------------- hour (0 - 23)
# |  |  .---------- day of month (1 - 31)
# |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
# |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7)  OR sun,mon,tue,wed,thu,fri,sat
# |  |  |  |  |
# *  *  *  *  *  command to be executed

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if crontab -e does not opening any text editor then you must set the environment variable  EDITOR or VISUAL
to do it :
export EDITOR=vi
export EDITOR=/usr/bin/gedit

to view all tasks in crontab run
crontab -l

each user has his own crontab files.

also make sure the file /etc/cron.deny does not contain your username
and if the file /etc/cron.allow exist make sure your name is in it.
if you dont need to allow or deny crontab just remove them both
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to run a task every monday at 10am
00 10 * * 1 /task/to/run
to run scripts/tasks on linux, take the following points into consideration

1- make the script executable (use chmod command)
2- set required env. variables since cron will not read the user .profile file
3- refer to files amd commands with full path names e.g. /usr/bin/cp
4- redirect stdin/stdoout/stderr as required

CMDAIAuthor Commented:
Thank's that does it
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