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Operating Systems Linux Ubuntu How to lock a file through UNIX KSH shell script? Post 302909335 by CarloM on Wednesday 16th of July 2014 07:51:34 AM
Old 07-16-2014
I assume this is a test case/prototype for something more complicated? Exactly what do you need to achieve? It's simpler to stop a duplicate script from running rather than trying to lock files individually.

Quote:
Originally Posted by hicksd8
If the script(s) only operate on files NOT starting "exec" then once the rename is done, the second script won't find those files.
If the scripts are using a for ls/find loop then they may well get the same (or very similar, depending on exact scheduling) list of files to operate on, since the renames (or most of them) won't have happened yet.
 

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PIDOF(8)						Linux System Administrator's Manual						  PIDOF(8)

NAME
pidof -- find the process ID of a running program. SYNOPSIS
pidof [-s] [-x] [-o omitpid] [-o omitpid..] program [program..] DESCRIPTION
Pidof finds the process id's (pids) of the named programs. It prints those id's on the standard output. This program is on some systems used in run-level change scripts, especially when the system has a System-V like rc structure. In that case these scripts are located in /etc/rc?.d, where ? is the runlevel. If the system has a start-stop-daemon (8) program that should be used instead. OPTIONS
-s Single shot - this instructs the program to only return one pid. -x Scripts too - this causes the program to also return process id's of shells running the named scripts. -o Tells pidof to omit processes with that process id. The special pid %PPID can be used to name the parent process of the pidof pro- gram, in other words the calling shell or shell script. NOTES
pidof is simply a (symbolic) link to the killall5 program, which should also be located in /sbin. When pidof is invoked with a full pathname to the program it should find the pid of, it is reasonably safe. Otherwise it is possible that it returns pids of running programs that happen to have the same name as the program you're after but are actually other programs. SEE ALSO
shutdown(8), init(8), halt(8), reboot(8) AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl 01 Sep 1998 PIDOF(8)
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