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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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Xsession.options(5)						File Formats Manual					       Xsession.options(5)

NAME
Xsession.options - configuration options for Xsession(5) DESCRIPTION
/etc/X11/Xsession.options contains a set of flags that determine some of the behavior of the Xsession(5) Bourne shell (sh(1)) script. See the Xsession(5) manpage for further information. Xsession.options may contain comments, which begin with a hash mark ('#') and end at the next newline, just like comments in shell scripts. The rest of the file consists of options which are expressed as words separated by hyphens, with only one option per line. Options are enabled by simply placing them in the file; they are disabled by prefixing the option name with 'no-'. Available options are: allow-failsafe If the 'failsafe' argument is passed to the Xsession script, an emergency X session is invoked, consisting of only an x-termi- nal-emulator(1) in the upper-left hand corner of the screen. No window manager is started. If an x-terminal-emulator program is not available, the session exits immediately. allow-user-resources If users have a file called .Xresources in their home directories, these resources will be merged with the default X resources when they log in. allow-user-xsession If users have an executable file called .xsession in their home directories, it can be used as the startup program for the X session (see Xsession(5)). If the file is present but not executable, it may still be used, but is assumed to be a Bourne shell script, and executed with sh(1). use-session-dbus If the dbus package is installed, the session bus will be activated at X session launch. use-ssh-agent If the ssh-agent(1) program is available and no agent process appears to be running already, the X session will be invoked by exec'ing ssh-agent with the startup command, instead of the startup command directly. All of the above options are enabled by default. Additional options may be supported by the local administrator. Xsession(5) describes how this is accomplished. AUTHORS
Stephen Early, Mark Eichin, and Branden Robinson developed Debian's X session handling scripts. Branden Robinson wrote this manual page. SEE ALSO
Xsession(5), ssh-agent(1), x-terminal-emulator(1) Debian Project 2004-10-31 Xsession.options(5)
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