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 Clear the terminal display. Equivalent to pressing Ctrl-L co znaczy.
- Co znaczy :
- Definicja Copy file archives from or to tape or disk, or to another location on the local machine. Each of the three flags -i , -o , or -p accepts different options krzyżówka.
- 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 administration command. Normally started in a system startup file. Execute commands at scheduled times, as specified in users' files in /var/spool/cron . Each file shares its name with the user słownik.
- Co znaczy :
- Definicja administration command. Change root directory for command or, if none is specified, for a new copy of the user's shell. This command or shell is executed relative to the new root. The meaning of czym jest.
Użycie CRONTAB zastosowanie komendy na linii poleceńw Słownik C .