Uruchomienie, wykonanie: crontab [options] [file]
Jak działa CRONTAB, co robi CRONTAB: View, install, or uninstall your current crontab file. A privileged user can run crontab for another user by supplying -u user. A crontab file is a list of commands, one per line, that will execute automatically at a given time. Numbers are supplied before each command to specify the execution time. The numbers appear in five fields, as follows:
Use a comma between multiple values, a hyphen to indicate a range, and an asterisk to indicate all possible values. For example, assuming these crontab entries:
59 3 * * 5 find / -print | backup_program 0 0 1,15 * * echo "Timesheets due" | mail user
the first command backs up the system files every Friday at 3:59 a.m., and the second command mails a reminder on the 1st and 15th of each month.
The superuser can always issue the crontab command. Other users must be listed in the file
Dostępne opcje, wywołanie CRONTAB:
The -e, -l, and -r options are not valid if any files are specified.
Edit the user's current crontab file (or create one).
Display the user's crontab file on standard output.
Delete the user's crontab file.
Indicate which user's crontab file will be acted upon.
- Co znaczy :
- Definicja columns from a file, where a column is a single character in a line. Read from standard input and write to standard output. Columns are numbered starting with 1; begin deleting columns at (including co to jest.
- Co znaczy :
- Definicja shell, either interactively or on the command line. Warn if shell does not exist in /etc/shells . Specify the full path to the shell. chsh prompts for your password. Only a privileged user can change definicja.
- Co znaczy :
- Definicja attributes. Specific to Linux Second and Third Extended Filesystem (ext2 and ext3). Behaves similarly to symbolic chmod , using + , - , and = . mode is in the form opcode attribute . See also lsattr co znaczy.
- Co znaczy :
- Definicja terminal N (that is, switch to /dev/ttyN ). If you have not created /dev/ttyN , it will be created when you use this command. There are keyboard shortcuts for this functionality as well. From a słownik.
- Co znaczy :
- Definicja System administration command. Start the print scheduler for the Common UNIX Printing System znaczenie.
Użycie CRONTAB zastosowanie komendy na linii poleceńw Słownik C .
