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home | helpCRONTAB(1) General Commands Manual CRONTAB(1) NAME crontab - User crontab manipulation SYNOPSIS crontab -c [user] file crontab -l [user] crontab -r [user] crontab -p DESCRIPTION The crontab program allows users to manipulate their personal crontab files. These files are hidden in /usr/spool/crontabs/user where user is the login name of a given user. The system daemon cron uses these crontabs, among others, to run tasks that are to be repeated at regular intervals. See crontab(5) on what a good crontab file should look like. Only the superuser can specify a user name to manipulate the crontab of a given user. Any other user can only touch their own crontab file. OPTIONS -c [user] file Install file as the crontab file of user. -l [user] List the crontab file of user to standard output. -r [user] Remove the crontab file of user. -p Tell cron to reload its tables. Useful for system administrators to signal a change to any of the system crontab files. Changes made by the crontab program are signalled automatically. (Mnemonic: -p = "ping".) FILES /usr/spool/crontabs/user Per user personal crontab file. SEE ALSO crontab(5), cron(8). DIAGNOSTICS Crontab preparses a new crontab and only installs it if correct. All errors are sent to standard error, messages about installing a new table and telling cron to reload are sent to standard output. BUGS Crontab misses a -e option that other implementations of this command allow one to edit the current crontab and install the result. Seems quite handy until you try to install a new crontab from an automated script. That's why this command has a -c option that installs a prepared crontab file. Use crontab -l >/tmp/tab ${EDITOR-vi} /tmp/tab crontab -c /tmp/tab to get the same effect as crontab -e. AUTHOR Kees J. Bot (kjb@cs.vu.nl) CRONTAB(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FILES | SEE ALSO | DIAGNOSTICS | BUGS | AUTHOR