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Full Discussion: ksh behavior change on RHEL5
Top Forums Shell Programming and Scripting ksh behavior change on RHEL5 Post 302416776 by bwhitehd on Tuesday 27th of April 2010 04:52:33 PM
Old 04-27-2010
You're correct, cron is not the issue specifically. It's the fact that the assigned value is one more than it should be.

Code:
#!/bin/ksh

echo $0
SCRIPT=${0##*/}
echo $SCRIPT
echo "IFS=xx${IFS}xx"
echo "PS=$(which ps)"
echo "GREP=$(which grep)"
echo "PGREP=$(which pgrep)"
echo "WC=$(which wc)"

/bin/ps -ef | /bin/grep -v grep | /bin/grep $SCRIPT
/bin/ps -ef | /bin/grep -v grep | /bin/grep $SCRIPT | /usr/bin/wc -l

echo "-----------"
 
/bin/ps -ef | /bin/grep -v grep | /bin/grep -c $SCRIPT
proc1=`/bin/ps -ef | /bin/grep -v grep | /bin/grep -c $SCRIPT`
echo "proc1=$proc1"
 
echo "-----------"
/bin/ps -ef | /bin/grep -v grep | /bin/grep -c $SCRIPT
proc2=$( (ps -ef | /bin/grep -v grep | /bin/grep -c $SCRIPT) )
echo "proc2=$proc2"
 
echo "-----------"
/usr/bin/pgrep $SCRIPT | /usr/bin/wc -l
proc3=$(/usr/bin/pgrep $SCRIPT | /usr/bin/wc -l)
echo "proc3=$proc3"

echo "-----------"
/bin/ps -ef | /bin/grep -v grep | /bin/grep $SCRIPT
/bin/ps -ef | /bin/grep -v grep | /bin/grep $SCRIPT | /usr/bin/wc -l

output from patched
Code:
> ./test2.ksh
./test2.ksh
test2.ksh
IFS=xx 
xx
PS=/bin/ps
GREP=/bin/grep
PGREP=/usr/bin/pgrep
WC=/usr/bin/wc
brian     3728   553  0 15:48 pts/8    00:00:00 /bin/ksh ./test2.ksh
1
-----------
1
proc1=2
-----------
1
proc2=2
-----------
1
proc3=2
-----------
brian     3728   553  0 15:48 pts/8    00:00:00 /bin/ksh ./test2.ksh
1

output from non-patched
Code:
> ./test2.ksh
./test2.ksh
test2.ksh
IFS=xx 
xx
PS=/bin/ps
GREP=/bin/grep
PGREP=/usr/bin/pgrep
WC=/usr/bin/wc
brian    11485 10981  0 15:50 pts/1    00:00:00 /bin/ksh ./test2.ksh
1
-----------
1
proc1=1
-----------
1
proc2=1
-----------
1
proc3=1
-----------
brian    11485 10981  0 15:50 pts/1    00:00:00 /bin/ksh ./test2.ksh
0

The last number of the non-patched system is incorrect here. "0" should be "1"
 

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LEARN ABOUT SUNOS

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)
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