Co robi LOCKFILE użycie. Konsola specified files, it pauses for eight seconds and retries the last.

Czy przydatne?

Polecenie lockfile

Wykonanie, użycie: Create semaphore file(s), used to limit access to a file. When lockfile fails to create some of the specified files, it pauses for eight seconds and retries the last one on which it failed. The command processes flags as they are encountered (i.e., a flag that is specified after a file will not affect that file). This command is most often used by scripts and applications as a way to avoid multiple users changing the same file at once

Opcje wykonania lockfile w konsoli

-sleeptime

Number of seconds lockfile waits before retrying after a failed creation attempt. Default is 8.

 -!

Invert return value. Useful in shell scripts.

 -l lockout_time

Time (in seconds) after a lockfile was last modified at which it will be removed by force. See also -s.

 -ml, -mu

If the permissions on the system mail spool directory allow it or if lockfile is suitably setgid, lockfile can lock and unlock your system mailbox with the options -ml and -mu, respectively.

 -r retries

Stop trying to create files after this many retries. The default is -1 (never stop trying). When giving up, remove all created files.

 -s suspend_time

After a lockfile has been removed by force (see -l), a suspension of 16 seconds takes place by default. (This is intended to prevent the inadvertent immediate removal of any lockfile newly created by another program.) Use -s to change the default suspend time.

Przykłady lockfile działanie w Słownik polecenie L

Przykład LOCKFILE użycie :
Jak użyć administration command. Examine the libraries in the given directories , /etc/ld.so.conf , /usr/lib , and /lib ; update links and cache where necessary. Usually run in startup files or after the co znaczy.
Przykład LOCKFILE użycie :
Jak użyć the print queue or queues. With options that take a list argument, omitting the list produces all information for that option. list can be separated by commas or, if enclosed in double quotes, by krzyżówka.
Przykład LOCKFILE użycie :
Jak użyć of filenames and print matches. Matches include all files that contain pattern unless pattern includes metacharacters, in which case locate requires an exact match. *, ?, [, and ] are treated co to jest.
Przykład LOCKFILE użycie :
Jak użyć login asks for a username (name can be supplied on the command line) and password (if appropriate). If successful, login updates accounting files, sets various environment variables, notifies users słownik.
Przykład LOCKFILE użycie :
Jak użyć Display a list of recent bad login attempts (from the /var/log/btmp file). Accepts the same option flags and arguments as last czym jest.