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Full Discussion: How to check if the script is already running?
Top Forums UNIX for Beginners Questions & Answers How to check if the script is already running? Post 302990721 by RudiC on Tuesday 31st of January 2017 07:08:40 AM
Old 01-31-2017
Let me see if I understand the request correctly: You have a NAS mounted on a number of servers sharing a shell script on that NAS. Only one single server is allowed to run one instance of the script at a given point in time, all others should be locked out during that run. The result is server dependent and should be stored locally on the respective server.
As it is many servers, local lock mecanisms won't work. Unless the OS offers lock mechanisms across all servers, you have to create one on your own.
Reading through your posts, I'm not sure if you differentiate between the lock file and the result file. You need both of them. While you can store the results locally, you should create the lock file some place available to all servers. One example - not being everybody's preferred choice - would be the script's path on the NAS, or e.g. a "lock" directory thereunder. You could use a simple file name, or a "personalized" one as Corona688 proposed, and use Scrutinizer's trap to remove it at script exit - not forgetting for the "normal", healthy script end.
No running scripts should be killed by the mechanism, but the nth instance should quit graciously when it sees another instance running, possibly logging such event when quitting.
 

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LEARN ABOUT OSF1

script

script(1)						      General Commands Manual							 script(1)

NAME

       script - Makes a transcript of terminal session

SYNOPSIS

       script [-a] [file]

       The script command makes a transcript of everything printed on your terminal.

OPTIONS

       Appends the transcript to file rather than writing it to file.

OPERANDS

       The name of an output file that will contain the transcript of the session.  If this parameter is omitted, the file typescript is written.

DESCRIPTION

       The transcript is written to file, or appended to file if the -a option is given.  If no file name is given, the transcript is saved in the
       file typescript.

       The script ends when the forked shell exits.

       This program is useful when you are using a CRT and want a hard-copy record of the dialog (for example, a technical writer might create	an
       example of a working session this way).

       If you specify the -a option and the file does not exist, it is created.

       If you do not specify the -a option and the file exists, it is replaced.

RESTRICTIONS

       The  script command requires a streams based terminal.  In single user mode, streams may not be enabled.  Under these circumstances, script
       will exit with no action.  If you are the superuser and need to run this command in single user mode, use the  following  special  instruc-
       tions.

   Enabling Streams
       If it is necessary to enable a streams environment in the single user mode, enter the command /sbin/init.d/streams.  This command is avail-
       able to the superuser only.

SEE ALSO

       Commands:  autopush(8), cat(1), echo(1), strsetup(8), tee(1)

       System Administration

																	 script(1)
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