Ps ax with grep in loop Post: 303019939

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Top Forums Shell Programming and Scripting Ps ax with grep in loop Post 303019939 by nms on Tuesday 10th of July 2018 12:14:43 PM

07-10-2018

Registered User

Hi RudiC,

In this case, the test was just used as an example. However, if we still take it for our case then nothing exists as a false positive:

Code:

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

in that case that would have returned a value, which means there is nothing related to "test" in our list.

Also if you take an existing process, it will count but adds 2.

Here's another example:

process: master

Code:

[root@matt Linux]# ps ax | grep master | grep -v grep
 1705 ?        Ss     5:42 /usr/libexec/postfix/master -w

So one process exists

if we run the script I have returned a value of 3, 1 for the process 2 not sure why the bash script is originating this number.
I could eventually subtract the value but doesn't make sense.

Code:

[root@am1-stp-oam01 Linux]# bash -x ./test2.sh master
+ PROCLIST=master
+ PROCESS=0
+ ERROR_PROCS=
+ IFS=+
+ read -ra ADDR
+ for PROC in '"${ADDR[@]}"'
++ ps ax
++ grep -v grep
++ wc -l
++ grep master
+ '[' 3 -lt 1 ']'
+ '[' 0 -eq 1 ']'
+ echo 'OK - All monitored processes are running. Process: master'
OK - All monitored processes are running. Process: master
+ exit 0

nms

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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  is used to invoke the grep on compress'ed or gzip'ed files. All options specified are passed directly to grep.  If no file is speci-
       fied, 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  zgrep  is invoked as zegrep or zfgrep then egrep or fgrep is used instead of grep.  If the GREP environment variable is set, zgrep uses
       it as the grep program to be invoked. For example:

	   for sh:  GREP=fgrep	zgrep string files
	   for csh: (setenv GREP fgrep; zgrep string files)

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

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

																	  ZGREP(1)

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