>>http://linux.die.net/man/1/crontab
http://linux.die.net/man/5/crontab
http://linux.die.net/man/8/crond
>>===cron crond crontab===
cron crond crontab are used as the system scheduler

==Your cron jobs==
%%# crontab -l | cut -c -70%%

==System cron jobs==
%%# cat /etc/crontab%%

==Everyones cron jobs==
%%#ls -lR /var/spool/cron/%%

==Edit Jobs==
%%# crontab -e%%

==crontab file format==
cron jobs run a maximum of once a minute
%%min hour day month day-of-week command # comment%%
you can use * to indicate every min/hour/day
you can use - to indicate ranges
you can use / to indicate intervals
examples

%%$ crontab -l%%

%%
* * * * * pwd            #every min of every day
*/10 9-17 * * 1-5 pwd             # every 10 mins between 9am - 5pm on monday - friday
%%

==cron emails==
By default cron emails commands output to 'cron' user so if you want email sent elsewhere you have to specify it and prevent any output using STDERR OutputRedirection (2>&1) (or >& if you also specifing a specific destination)

%%$ crontab -l%%

%%
10 * * * 1-5 pwd 2>&1 | smtp=upstream /usr/local/bin/mailx -s "<subject>" <diffuser@diffdomain> 
%%

SystemDefaultCronTab

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