Why not just have a script with the program name as a parameter "su" to the user holding the lock.
For those who are wondering, you need an "unlock" script for the cases when programmers check out a program using "co" with some intention to make changes ... and then make no changes.
As administrator (i.e. root) I always run an unlock script while in a "su" session as the user holding the lock. This way the unlock program does not ask questions.
This code is in my 'case' statement and it all else works fine.
The problem I have is that the value in 'procno' is not passed on to the external program (fireit).
It is passing all zeros instead of the actual process number.
By the time I get to this case statement, I know the "Number" and... (1 Reply)
Hello,
in the application i'm writing i need to launch "recordmydesktop" to capture the screen,but i'm having a problem: when the recording stops,and the encoding of the saved file starts,the entire system hangs until the completion of the encoding.This happens if i launch recordmydesktop from my... (7 Replies)
Hi,
in my program i need to run an external program in background.I am aware that there are at least 2 alternatives for this:
1)fork+exec
2)system("program &");
I have read several posts about this,and they all tend to suggest to use fork+exec (and that's what i am doing now).
I have some... (2 Replies)
Hi!
I have a python script that requires arguments and these arguments are file paths. This script works fine when executed like this:
/my_python_script "file_path1" "file_path2"
(i added quotes as some file names may have weird characters)
the issue happens when i launch my python script... (14 Replies)
Hi, I was hoping for help with a for loop to run a program (vina) repeatedly using all the files in a folder as input. Currently my code looks like this:
#!/bin/bash
FILES=/home/afalk/Desktop/battest/*.pdbqt
for f in $FILES do
vina --config /home/afalk/Desktop/A.txt --ligand "$f".pdbqt
done... (5 Replies)
Hi,
How can I modify the FILETYPE command ?
I want to provide the file extension, like txt, root .?
Thanks,
#!/bin/bash
FROM=$1
TO=$2
FILETYPE=$3
... (4 Replies)
my $sysdate = strftime('%Y-%m-%d', localtime );
biDeriveByDate('Table_Str',$sysdate,\@lIndx,\@lResVals)
In a perl script, when I'm trying to pass $sysdate to some external function it's not working since $sysdate is passed as a string mentioned above but my function is expecting a date value... (1 Reply)
Hi,
I am trying to write a bash script in which I need to pass a external variable to the awk program. I tired using -v but it not accepting the value.
Here is my sample code.
#!/usr/bin/bash
######################################################################################
####... (5 Replies)
I have a code which is using to find duplicates in a files based on column.Below is the same code which is used to find duplicates in my file based on column 1
awk -F'|' '{if (x) { x_count++; print $0; if (x_count == 1) { print x } } x = $0}' FileName >Dup_File.txt
But my requirement here is... (3 Replies)
Discussion started by: ginrkf
3 Replies
LEARN ABOUT LINUX
mail-lock
lockfile-progs(1) Lockfile programs lockfile-progs(1)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. How-
ever, 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 current process id (PID) 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, lockfile-remove, lockfile-touch, and
lockfile-check.
-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 incre-
ments) 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.
SEE ALSO maillock(3)touchlock(3)mailunlock(3)lockfile_create(3)lockfile_remove(3)lockfile_touch(3)lockfile_check(3)AUTHOR
Written by Rob Browning <rlb@defaultvalue.org>
0.1.12 2008-02-10 lockfile-progs(1)