EnglishFrenchSpanish

OnWorks favicon

lockfile-remove - Online in the Cloud

Run lockfile-remove in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command lockfile-remove that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


lockfile-progs - command-line programs to safely lock and unlock files and mailboxes (via
liblockfile).

SYNOPSIS


mail-lock [--use-pid] [--retry retry-count]
mail-unlock
mail-touchlock [--oneshot]

lockfile-create [--use-pid] [--retry retry-count] [--lock-name] filename
lockfile-remove [--lock-name] filename
lockfile-touch [--oneshot] [--lock-name] filename
lockfile-check [--use-pid] [--lock-name] filename

DESCRIPTION


Lockfile-progs provides a set a programs that can be used to lock and unlock mailboxes and
files safely (via liblockfile):

mail-lock - lock the current user's mailbox
mail-unlock - unlock the current user's mailbox
mail-touchlock - touch the lock on the current user's mailbox

lockfile-create - lock a given file
lockfile-remove - remove the lock on a given file
lockfile-touch - touch the lock on a given file
lockfile-check - check the lock on a given file

By default, the filename argument refers to the name of the file to be locked, and the
name of the lockfile will be filename .lock. However, if the --lock-name argument is
specified, then filename will be taken as the name of the lockfile itself.

Each of the mail locking commands attempts to lock /var/spool/mail/<user>, where <user> is
the name associated with the effective user ID, as determined by via geteuid(2).

Once a file is locked, the lock must be touched at least once every five minutes or the
lock will be considered stale, and subsequent lock attempts will succeed. Also see the
--use-pid option and the lockfile_create(3) manpage.

The lockfile-check command tests whether or not a valid lock already exists.

OPTIONS


-q, --quiet
Suppress any output. Success or failure will only be indicated by the exit status.

-v, --verbose
Enable diagnostic output.

-l, --lock-name
Do not append .lock to the filename. This option applies to lockfile-create,
lockfile-remove, lockfile-touch, or lockfile-check.

-p, --use-pid
Write the parent process id (PPID) to the lockfile whenever a lockfile is created, and
use that pid when checking a lock's validity. See the lockfile_create(3) manpage for
more information. This option applies to lockfile-create and lockfile-check. NOTE:
this option will not work correctly between machines sharing a filesystem.

-o, --oneshot
Touch the lock and exit immediately. This option applies to lockfile-touch and
mail-touchlock. When not provided, these commands will run forever, touching the lock
once every minute until killed.

-r retry-count, --retry retry-count
Try to lock filename retry-count times before giving up. Each attempt will be delayed
a bit longer than the last (in 5 second increments) until reaching a maximum delay of
one minute between retries. If retry-count is unspecified, the default is 9 which
will give up after 180 seconds (3 minutes) if all 9 lock attempts fail.

EXAMPLES


Locking a file during a lengthy process:

lockfile-create /some/file
lockfile-touch /some/file &
# Save the PID of the lockfile-touch process
BADGER="$!"
do-something-important-with /some/file
kill "${BADGER}"
lockfile-remove /some/file

EXIT STATUS


0
For lockfile-check this indicates that a valid lock exists, otherwise it just
indicates successful program execution.

Not 0
For lockfile-check a non-zero exit status indicates that the specified lock does not
exist or is not valid. For other programs it indicates that some problem was
encountered.

Use lockfile-remove online using onworks.net services


Free Servers & Workstations

Download Windows & Linux apps

  • 1
    Phaser
    Phaser
    Phaser is a fast, free, and fun open
    source HTML5 game framework that offers
    WebGL and Canvas rendering across
    desktop and mobile web browsers. Games
    can be co...
    Download Phaser
  • 2
    VASSAL Engine
    VASSAL Engine
    VASSAL is a game engine for creating
    electronic versions of traditional board
    and card games. It provides support for
    game piece rendering and interaction,
    and...
    Download VASSAL Engine
  • 3
    OpenPDF - Fork of iText
    OpenPDF - Fork of iText
    OpenPDF is a Java library for creating
    and editing PDF files with a LGPL and
    MPL open source license. OpenPDF is the
    LGPL/MPL open source successor of iText,
    a...
    Download OpenPDF - Fork of iText
  • 4
    SAGA GIS
    SAGA GIS
    SAGA - System for Automated
    Geoscientific Analyses - is a Geographic
    Information System (GIS) software with
    immense capabilities for geodata
    processing and ana...
    Download SAGA GIS
  • 5
    Toolbox for Java/JTOpen
    Toolbox for Java/JTOpen
    The IBM Toolbox for Java / JTOpen is a
    library of Java classes supporting the
    client/server and internet programming
    models to a system running OS/400,
    i5/OS, o...
    Download Toolbox for Java/JTOpen
  • 6
    D3.js
    D3.js
    D3.js (or D3 for Data-Driven Documents)
    is a JavaScript library that allows you
    to produce dynamic, interactive data
    visualizations in web browsers. With D3
    you...
    Download D3.js
  • More »

Linux commands

Ad