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+====== Crontab ======
+A linux demon useful to schedule tasks (i.e., execute some scripts).
+To edit ''contab'' file:
+<code bash>
+crontab -e
+</code>
+To list the scheduled tasks:
+<code bash>
+crontab -l
+</code>
+Example:
+<code bash>
+3 * * * /home/user/crontab_backup.sh > /dev/null 2> /home/user/crontab_backup.error
+</code>
+this command executes the script ''crontab_backup.sh'' that is in the directory ''/home/user'' every day at 3am. The output of the script is discharged (i.e., ''stdout'' is redirected to ''/dev/null''), while errors (writes on ''stderr'') are redirected in the ''crontab_backup.error'' located in the directory ''/home/user''.
+Examples regarding the scheduling:
+  * ''0 3 * * 2,4,6'' : The command is executed at 3am the days of the week number with numbers 2, 4 and 6 (numbers are: 0-Sunday, 1-Monday, 2-Tuesday, 3-Wednesday, 4-Thursday, 5-Friday, 6-Saturday)
+  * ''30 3 * * *'' : The command is executed at 3:30am every day
+  * ''30 3 1 * *'' : The command is executed ad 3:30am every first day of every month

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