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Full Discussion: Retrieving PID from a file
Top Forums UNIX for Dummies Questions & Answers Retrieving PID from a file Post 302141004 by appleforme1415 on Wednesday 17th of October 2007 06:42:06 AM
Old 10-17-2007
Retrieving PID from a file

Hello

I need to retrieve the content of a file in the shell script file(.sh file).
I store the Process ID of the a process in file.Only the PID is available in that file.

Inside the shell script i want to retireve the content(PID) and need to check for the existence of the Process.Basically i use this mechanism to make sure a process is not started more than once in a machine.

Kindly let me know how to retrieve the content of a file inside shell script and assign that content to a variable.

Last edited by appleforme1415; 10-17-2007 at 09:02 AM..
 

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script(1)							   User Commands							 script(1)

NAME
script - make record of a terminal session SYNOPSIS
script [-a] [filename] DESCRIPTION
The script utility makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the record is saved in the file typescript. See WARNINGS. The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends when the forked shell exits or when Control-d is typed. OPTIONS
The following option is supported: -a Appends the session record to filename, rather than overwriting it. NOTES
script places everything that appears on the screen in filename, including prompts. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5) WARNINGS
script can pose a security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a privileged user, that is, root. Be sure that typescript is not a link before running script. SunOS 5.10 30 Jan 2004 script(1)
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