will child processes be created when executing "ps"? Post: 302506737

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Top Forums Shell Programming and Scripting will child processes be created when executing "ps"? Post 302506737 by sleepy_11 on Monday 21st of March 2011 08:26:50 PM

03-21-2011

Registered User

rbatte1,

thanks for your reply.

I'm working on Solaris10 system. Below are the full program, which i removed other un-related part:

Code:

#!/usr/bin/ksh
SCRIPT_NAME="myprogram.ksh"
SCRIPT_PID=$$
ENV_DEFAULT_CFG=/opt/myprogram/env.cfg

    #Is another instance running
 echo $$
    IGNORE_OPTS=' \-ug| \-userguide| \-h| \-help| \-v | \-config'
    /usr/ucb/ps  -alxww | egrep -v 'grep |vi |tail |more |cat ' | egrep ${SCRIPT_NAME} | \
                  egrep -v "${IGNORE_OPTS}" |egrep -v ${SCRIPT_PID} | nawk '{print $0}'
				  
    if [[ -n "${pid}" && "${pid}" != "${SCRIPT_PID}" ]];then
        echo "pid=${pid}"
    fi
echo "finished\n"

Basically, i hope there is no output besides the "finished". But sometimes, about 1/4, there are other process found like below:

Code:

 0     0 23568 27072  0   0 20 1456 1360 60021f64340 S pts/7     0:00 /usr/bin/ksh ./myprogram.ksh
 0     0 23594 23568  0   0 20 1448    ?          R pts/7     0:00 /usr/bin/ksh ./myprogram.ksh
 0     0 23596 23568  0   0 20 1448    ?          R pts/7     0:00 /usr/bin/ksh ./myprogram.ksh
 0     0 23597 23568  0   0 20 1448    ?          R pts/7     0:00 /usr/bin/ksh ./myprogram.ksh

Please let me know there is any info needed.

Last edited by pludi; 03-22-2011 at 04:53 AM..

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getusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

       /bin/bash		  /bin/csh
       /bin/jsh 		  /bin/ksh
       /bin/pfcsh		  /bin/pfksh
       /bin/pfsh		  /bin/sh
       /bin/tcsh		  /bin/zsh
       /sbin/jsh		  /sbin/pfsh
       /sbin/sh 		  /usr/bin/bash
       /usr/bin/csh		  /usr/bin/jsh
       /usr/bin/ksh		  /usr/bin/pfcsh
       /usr/bin/pfksh		  /usr/bin/pfsh
       /usr/bin/sh		  /usr/bin/tcsh
       /usr/bin/zsh		  /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

SunOS 5.10							    30 Aug 2004 						  getusershell(3C)