grep the number of self process Post: 302305834

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Top Forums Shell Programming and Scripting grep the number of self process Post 302305834 by tiger2000 on Thursday 9th of April 2009 09:34:29 PM

04-09-2009

Registered User

grep the number of self process

Dear All,

I plan to write a script and in the beginning, I will check if there's any existing previous process running, if YEs, then exit directly, if Not, then continue.

Code:

#!/bin/bash

NUM=`ps -ef | grep $0 | grep -v grep | wc -l`

ps -ef | grep $0 | grep -v grep
echo "NUM ==> $NUM"

if [ $NUM -ne 1 ]; then
   echo "previous processing running, exit"
   exit 1
fi

echo "Hello...  I got here.."

I can not understand, why running this script will return :

====================================
root 7815 29364 0 09:30 pts/0 00:00:00 /bin/bash ./2.sh
NUM ==> 2
previous processing running, exit
====================================

from "ps -ef | grep $0 | grep -v grep " command, it's obvious that only one line return, why $NUM will become 2 ??

any advice on this?

Thanks.

Last edited by Yogesh Sawant; 04-10-2009 at 08:17 AM.. Reason: added code tags

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LEARN ABOUT LINUX

xzgrep

XZGREP(1)							     XZ Utils								 XZGREP(1)

NAME

       xzgrep - search compressed files for a regular expression

SYNOPSIS

       xzgrep [grep_options] [-e] pattern file...
       xzegrep ...
       xzfgrep ...
       lzgrep ...
       lzegrep ...
       lzfgrep ...

DESCRIPTION

       xzgrep  invokes	grep(1)  on  files  which may be either uncompressed or compressed with xz(1), lzma(1), gzip(1), or bzip2(1).  All options
       specified are passed directly to grep(1).

       If no file is specified, then standard input is decompressed if necessary and fed to grep(1).  When reading from  standard  input,  gzip(1)
       and bzip2(1) compressed files are not supported.

       If  xzgrep  is  invoked as xzegrep or xzfgrep then egrep(1) or fgrep(1) is used instead of grep(1).  The same applies to names lzgrep, lze-
       grep, and lzfgrep, which are provided for backward compatibility with LZMA Utils.

ENVIRONMENT

       GREP   If the GREP environment variable is set, xzgrep uses it instead of grep(1), egrep(1), or fgrep(1).

SEE ALSO

       grep(1), xz(1), gzip(1), bzip2(1), zgrep(1)

Tukaani 							    2010-09-27								 XZGREP(1)

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