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Top Forums Shell Programming and Scripting Script executable only for one person at same time Post 302399677 by DarkSwiss on Monday 1st of March 2010 08:02:58 AM
Old 03-01-2010
Script executable only for one person at same time

Hi

My question:
Is there a way to lock a script if its already running for other users?

Like if i want to start a script, that is running by another user, there will be a message: Hey, you cant start the script because its running by another user, try it later.



my idea was that the script creates a tmp-file, what will be deleted at the end of the script. If everyone starts the script, there will be a scan: does the tmp-file exist, if yes: error message, if no: you can start the script.

The problem of my idea is that if the script has a crash, the tmp-file still exist and nobody can start the script anymore.

Do you have another, probably a better idea how i can resolve this problem?

Best regards
Roger M.

Last edited by pludi; 03-01-2010 at 09:06 AM.. Reason: removed email
 

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SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME
script -- make typescript of terminal session SYNOPSIS
script [-a] [-c COMMAND] [-f] [-q] [-t] [file] DESCRIPTION
Script makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. Options: -a Append the output to file or typescript, retaining the prior contents. -c COMMAND Run the COMMAND rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves differently when its stdout is not a tty. -f Flush output after each write. This is nice for telecooperation: One person does `mkfifo foo; script -f foo' and another can super- vise real-time what is being done using `cat foo'. -q Be quiet. -t Output timing data to standard error. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays. The script ends when the forked shell exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. Script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism), scriptreplay(1). HISTORY
The script command appeared in 3.0BSD. BUGS
Script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. AVAILABILITY
The script command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/. Linux July 30, 2000 Linux
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