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Full Discussion: Ps ax with grep in loop
Top Forums Shell Programming and Scripting Ps ax with grep in loop Post 303019936 by nms on Tuesday 10th of July 2018 11:33:11 AM
Old 07-10-2018
Ps ax with grep in loop
Hello,

I have built the following script to check if processes supplied by the argument are running or not.

Code:
#!/bin/bash

PROCLIST=$1

PROCESS="0"
ERROR_PROCS=""
IFS='+'
read -ra ADDR <<< "$PROCLIST"
for PROC in "${ADDR[@]}"; do
                if [ `ps ax | grep $PROC | grep -v grep | wc -l` -lt 1 ]; then
                PROCESS=1
                ERROR_PROCS="$ERROR_PROCS""$PROC ";
                fi
        done

        if [ $PROCESS -eq 1 ]; then
                echo "CRITICAL - One or more processes ($ERROR_PROCS) not running"
                exit 2
        fi


echo "OK - All monitored processes are running. Process: $PROCLIST"
exit 0

it seems it works fine apart from the fact the "ps ax | grep "process" | wc -l" gives a higher count than expected.
For example, if we take the process named "test" (which doesn't exist), it returns a count of 2.

Code:
[root@matt Linux]# ps ax | grep test | grep -v grep
[root@matt Linux]#

if We run the script with verbose:

Code:
[root@matt Linux]# bash -x ./test2.sh test
+ PROCLIST=test
+ PROCESS=0
+ ERROR_PROCS=
+ IFS=+
+ read -ra ADDR
+ for PROC in '"${ADDR[@]}"'
++ ps ax
++ grep test
++ wc -l
++ grep -v grep
+ '[' 2 -lt 1 ']'
+ '[' 0 -eq 1 ']'
+ echo 'OK - All monitored processes are running. Process: test'
OK - All monitored processes are running. Process: test
+ exit 0

What could be the reason that it captures the value of 2? This also happens if the process does exist. in that case, it returns a 3.

Rgds,

Matthew
 

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LEARN ABOUT SUNOS

gst-complete

gst-complete-0.8(1)						   User Commands					       gst-complete-0.8(1)

NAME

       gst-complete-0.8, gst-complete - perform bash completion for gst-launch command lines

SYNOPSIS

       complete -Cgst-complete-0.8 gst-launch

       gst-complete [--gst-list-mm] [--gst-mm=string] [--print]

DESCRIPTION

       gst-complete-0.8 enables bash to provide context-sensitive tab completion for gst-launch command lines. See gst-launch(1) for the syntax of
       gst-launch command lines.

       You must have a version of bash that supports programmable completion. Such versions of bash provide the complete built-in command.

       gst-complete is a wrapper script that runs the latest installed version of gst-complete-X.X. For example, if both gst-complete-0.7 and gst-
       complete-0.8 are installed on your system, gst-complete runs gst-complete-0.8.

OPTIONS

       The following options are supported by gst-complete-0.8 and gst-complete:

       --help	       Display detailed usage message. You can also use -? to specify this option.

       The following options are supported by gst-complete only:

       --gst-list-mm   List found major/minor versions. This option displays the versions that are available.

       --gst-mm=string Force  major/minor  version.  This  option  enables you to specify a specific version to run, if you do not want to run the
		       default version.

       --print	       Print wrapped command line. This option displays the command that will be run, and then runs the command.

EXAMPLES

       Example 1: Generating the Registry of Available Plugins by Running gst-compprep

       Run the following command in your .bash_profile or other appropriate place:

       example% complete -C gst-complete-0.8 gst-launch

       Example 2: Running the Wrapper Script and Displaying the Command Name

       example% gst-complete --print
       /usr/bin/gst-complete-0.8

FILES

       The following files are used by this application:

       /usr/bin/gst-complete-0.Executable for bash completion for gst-launch

       /usr/bin/gst-complete   Wrapper script that runs the latest installed version of gst-complete-X.X

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWgnome-media		   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |External			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       gst-compprep(1), gst-feedback(1), gst-inspect(1), gst-launch(1), gst-launch-ext(1), gst-md5sum(1), gst-register(1), gst-thumbnail(1),  gst-
       typefind(1), gst-xmlinspect(1), gst-xmllaunch(1), gstreamer-properties(1), libgstreamer-0.8(3), libgstgetbits(3)

NOTES

       Original man page written by the GStreamer team at http://gstreamer.net/.

       Updated by Brian Cameron, Sun Microsystems Inc., 2004.

SunOS 5.10							    14 Oct 2004 					       gst-complete-0.8(1)
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