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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shells

shells(4)							   File Formats 							 shells(4)

NAME

       shells - shell database

SYNOPSIS

       /etc/shells

DESCRIPTION

       The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
       shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.

       A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by  the  routines
       which search the file. Blank lines are also ignored.

       The  following  default	shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/pfcsh, /bin/pfksh, /bin/pfsh, /bin/sh,
       /bin/tcsh,  /bin/zsh,  /sbin/jsh,  /sbin/sh,  /usr/bin/bash,  /usr/bin/csh,  /usr/bin/jsh,  /usr/bin/ksh,  /usr/bin/pfcsh,  /usr/bin/pfksh,
       /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh. Note that /etc/shells overrides the default list.

       Invalid shells in /etc/shells may cause unexpected behavior (such as being unable to log in by way of ftp(1)).

FILES

       /etc/shells	       lists shells on system

SEE ALSO

       vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)

SunOS 5.10							    4 Jun 2001								 shells(4)