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Full Discussion: facing problem in starting a process in background using shell script.
Top Forums Shell Programming and Scripting facing problem in starting a process in background using shell script. Post 302186430 by era on Thursday 17th of April 2008 08:11:41 AM
Old 04-17-2008
As a side remark on stylistic issues, this

Code:
if [ `ps -p $PID|grep $PID|wc -l` -eq 1 ]

is better expressed simply as

Code:
if ps -p $PID | grep $PID >/dev/null

because grep will return true if there was a match, and false otherwise.

The redirection to /dev/null is because grep prints the matching line, which you don't want in this case. Many grep implementations also have a -q option which does the same thing.
 

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LEARN ABOUT ULTRIX

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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