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Retrieving PID from a file


 
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# 1  
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 10:02 AM..
# 2  
Old 10-17-2007
kindly shed some light on it
# 3  
Old 10-17-2007
Quote:
Originally Posted by appleforme1415
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.
Code:
PS(1)                   General Commands Manual                   PS(1)

NAME
     ps -- process status

SYNOPSIS
     ps [-acCehjlmrsSTuvwx] [-k key] [-M core] [-N system] [-O fmt] [-o fmt]
        [-p pid] [-t tty] [-U username] [-W swap]
     ps [-L]

Try the -p option.
# 4  
Old 10-17-2007
Quote:
Kindly let me know how to retrieve the content of a file inside shell script and assign that content to a variable.
Code:
pidVar=`cat pidFile`

# 5  
Old 10-18-2007
Tried out the following

Code:
pidVar='cat pidFile'
echo $pidVar


Output i got is
Code:
cat pidFile

Kindly tell me way to get the content of the file by using the above command.

Badically file only contains PID.
# 6  
Old 10-18-2007
Sorry to say ... it is my mistake ... i shud have used ` symbol.
Instead i have use single quotes(').

Thanks Madhan for the precise reply.
 

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