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 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 co znaczy.
- Co znaczy :
- Definicja preprocessor . cpp is normally invoked as the first pass of any C compilation by the gcc command. The output of cpp is a form acceptable as input to the next pass of the C compiler. The ifile and krzyżówka.
- Co znaczy :
- Definicja columns or fields from one or more files . In the following options, list is a sequence of integers. Use a comma between separate values, and a hyphen to specify a range (e.g., 1-10 ,15 ,20 or 50 co to jest.
- Co znaczy :
- Definicja common to the sorted files file1 and file2 . Output is in three columns, from left to right: lines unique to file1 , lines unique to file2 , and lines common to both files. comm is similar to diff in słownik.
- Co znaczy :
- Definicja mode (permissions) of one or more files . Only the owner of a file or a privileged user may change the mode. mode can be numeric or an expression in the form of who opcode permission . who is czym jest.
Użycie CRONTAB zastosowanie komendy na linii poleceńw Słownik C .
