can someone explain crontab to me better?

[robg]

hi,

i am having a hard time understanding crontab after reading
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/configtuning-cron.html
.. i still can't understand the minutes/hours...

when you specify minutes, does it mean the command is run every X
minutes? and if you specify a hour AND minutes, the command is run
every X hours for X minutes?  so if i did

*/5 */2 * * * root /usr/libexec/locate.updatedb

it would run that command every two hours for 5 minutes?  so when two
hours comes around, itll keep running that command over and over for 5
minutes? or will it run that command once every 5 minutes for two
hours? im confused

i just want to know the syntax to run something every 2 hours once ..
can someone clarify this

thanks


-- 
robg
robg.list at gmail.com