[...]
So what I've did is to have it this way:
and it worked... don't know why it behaved that way.
This should work fine if you're sure that your script will always be executed with bash
(and - really less likely to happen - that the name of the script will never appear in the process list for some other reason).
You may implement a lock/flag file like this:
1. In the above demo I'm using some constructs that are not available in the old (the traditional) Bourne shell (the parameter expansion).
2. In one place I'm using a non standard (not POSIX) syntax, but that construct is available in most modern shells.
On HP-UX, in application, if the process id has been get with the getpid() and sotred in database, then other monitor process want to check it if the process is existed, are there any system function can do it? I do not want to use the shell script, because it should use popen function to excuted... (5 Replies)
Hi Experts,
Is there any command by which i can chk that the cron process is running fine? Say i have scheduled the cron to run at 10 o clock every monday,Do i need to wait for the time it runs and then chk using ps -ef?
Please shed some light.
Thanks
Ashok. (2 Replies)
Hi
I have a scenario where i need to check multiple instances of a running shell script (abc.sh) .
How can I find from inside a running shell script whether any other instance of the same script is running or not? If any other instance of same shell script is running I need to exit from... (4 Replies)
Hi all,
I have the following code:
if ; then echo 'folder not exist'; else echo 'folder exist'; fi
The "testing" folder is not exist in /home/batch , but thhe result is 'folder exist'. It seems that the code cannot detect that the folder "testing" not exist.
ANybody know the... (1 Reply)
Hi,
I want to create a script who will check if the java process is running & if it finds the process is still there it continues to execute & when the process completes it exit from the script.
I have written a code to check & notify the process existence but i am not getting how to write... (4 Replies)
How can i check block process in Linux?
If found any what action is required?
How to check the pid of process?
How to kill the block process?
How to find out bottleneck process? (3 Replies)
Hi,
I need to know who can I create an script in order to check server mirror in AIX. I got this script
!/usr/bin/ksh
#
# Check if a VG is mirrored.
#
# lsattr -El <lvname> -a strictness -a copies
# If copies=2 and scrictness=y, then VG is mirrored
#
# LVs are retrieved via 'lsvg -l... (5 Replies)
Good morning, I have a python 2.3 script that runs stand alone as intended when tested, then it was put into a ksh script. when running the ksh script it runs as intended. The problem is that my script does not run when the ksh script is called by another user who runs a batch process (as of right... (1 Reply)
Hello Everyone,
I have a process that should be always running. Unfortunately, this process is getting down almost every 10 minutes. I want to make a script that verify the state of this process: If the process is up, the script shouldn't do nothing and if it's down he should run it.
Can... (3 Replies)
Hi All,
I am writing script for Env refresh for Oracle DB. I am using Datapump for that. If i start expdp or impdp, how can i know that export or import has completed. I have query for that. How will i integrate with script?. Or any command i can run from Linux side. Please share you... (1 Reply)
Discussion started by: pvmanikandan
1 Replies
LEARN ABOUT SUSE
shlock
SHLOCK(1) InterNetNews Documentation SHLOCK(1)NAME
shlock - Create lock files for use in shell scripts
SYNOPSIS
shlock [-b|-c|-u] -f name -p pid
DESCRIPTION
shlock tries to create a lock file named name and write the process ID pid into it. If the file already exists, shlock will read the
process ID from the file and test to see whether the process is currently running. If the process exists, then the file will not be
created. shlock exits with a zero status if it could create the lock file, or non-zero if the file refers to a currently active process.
OPTIONS -b Process IDs are normally read and written in ASCII. If the -b flag is used, then they will be written as a binary int.
-c If the -c flag is used, then shlock will not create a lock file, but will instead use the file to see if the lock is held by another
program. If the lock is valid, the program will exit with a non-zero status; if the lock is not valid (i.e. invoking shlock without
the flag would have succeeded), then the program will exit with a zero status.
-f name
name is the name of the lock file shlock attempts to create. If the file already exists, it will read the process ID from the file and
exit with a non-zero status if this process is currently active.
-p pid
pid is the process ID to write into the file name.
-u For compatibility with other systems, the -u flag is accepted as a synonym for -b since binary locks are used by many UUCP packages.
EXAMPLES
The following example shows how shlock would be used within a shell script:
LOCK=<pathrun in inn.conf>/LOCK.send
trap 'rm -f ${LOCK} ; exit 1' 1 2 3 15
if shlock -p $$ -f ${LOCK} ; then
# Do appropriate work.
else
echo "Locked by `cat ${LOCK}`"
fi
HISTORY
Written by Rich $alz <rsalz@uunet.uu.net> for InterNetNews after a description of HDB UUCP locking given by Peter Honeyman, and improved by
Berend Reitsma to solve a race condition. Converted to POD by Julien Elie.
$Id: shlock.pod 8357 2009-02-27 17:56:00Z iulius $
INN 2.5.2 2009-05-21 SHLOCK(1)