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Operating Systems Linux Ubuntu How to lock a file through UNIX KSH shell script? Post 302909283 by piuli on Wednesday 16th of July 2014 01:34:28 AM
Old 07-16-2014
Display How to lock a file through UNIX KSH shell script?

I wrote two shell scripts in UNIX that renames the same file and scheduled them at the same time.

The following are the steps that I followed:-
1. I wrote 2 scripts named s1.sh and s2.sh, both trying to add “exec_” prefix to the name of the files present in a folder i which already don't start with “exec_”. When any script performs the renaming operation, then that step is noted in their respective log file.
For e.g., if script s1.sh tries to rename f1 file, then the message “f1 has been renamed to exec_f1” along with the time of the action is written in log1 file.
3. I scheduled both the scripts at the same time with the following 2 commands :-
a. at -f s1.sh 5:36 PM
b. at -f s2.sh 5:36 PM
The output that we saw was that in both log1 and log2 files same actions were logged at the same time. So, both the scripts accessed the same file at the same time.


Now what I want to do is if suppose s1.sh has already accessed a file called f1 then s2.sh will not access it and will take the next file say f2.

Can anyone please tell me how to do that?
 

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NAUTILUS-SCRIPTS-MANAGER(1)				      General Commands Manual				       NAUTILUS-SCRIPTS-MANAGER(1)

NAME
nautilus-scripts-manager - easy tool for nautilus scripts management SYNOPSIS
nautilus-scripts-manager [options] DESCRIPTION
This manual page documents briefly the nautilus-scripts-manager command. nautilus-scripts-manager is a program that allows any user to easily manage installed Nautilus scripts. GENERAL OPTIONS
-h, --help Show summary of options. -v, --version Show version of program. COMMANDS
One (and only one) of the following commands can be passed: -e, --enable=ENABLE Enable script ENABLE. -d, --disable=DISABLE Disable script DISABLE. -l, --list-enabled List enabled scripts. -a, --list-available List available scripts. If no command is provided, the graphical interface is started. OPTIONS
-e, --position=POSITION In conjunction with -e or -d: establish the position of the script (can be just a name, or a path with slashes - quote it if it con- tains spaces). SEE ALSO
nautilus(1), AUTHOR
nautilus-scripts-manager and this manual page were written by Pietro Battiston <me@pietrobattiston.it>. This manual page was written for the Debian project (but may be used by others). July 14, 2009 NAUTILUS-SCRIPTS-MANAGER(1)
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