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Full Discussion: How to fetch running/failed process
Top Forums Shell Programming and Scripting How to fetch running/failed process Post 302295033 by ce9888 on Friday 6th of March 2009 11:12:58 AM
Old 03-06-2009
Quote:
Originally Posted by vgersh99
'man ksh' yields the following:
Code:
     ?     The decimal value returned by the last  executed  com-
           mand.

In your case 'grep -v grep'
Logicaly you are right how can you explain this :

Code:
ce9888$ ps -ef | grep -i fiha                                
    user  37558      1   0 08:50:57      -  0:00 /home/s/sys/fiha  
  ce9888  41702  50948   0 10:57:09 pts/12  0:00 grep -i fiha 
    user  56818      1   0 08:50:57      -  0:00 /home/s/sys/fiha  
    user  65156      1   0 08:50:57      -  0:00 /home/s/sys/fiha  
    user  66926      1   0 08:50:57      -  0:00 /home/s/sys/fiha 
    user  67088      1   0 08:50:57      -  0:00 /home/s/sys/fiha  
    user  67470      1   0 08:50:57      -  0:00 /home/s/sys/fiha  
    user  68270      1   0 08:50:57      -  0:00 /home/s/sys/fiha 
    user  68366      1   0 08:50:57      -  0:34 /home/s/sys/fiha  
    user  68980      1   0 08:50:57      -  0:00 /home/s/sys/fiha
    user  72298      1   0 08:50:57      -  0:05 /home/s/sys/fiha
ce9888$ echo $?
0

Code:
ce9888$ ps -ef | grep -i fiha | grep -v grep                 
    user  37558      1   0 08:50:57      -  0:00 /home/s/sys/fiha 
    user  56818      1   0 08:50:57      -  0:00 /home/s/sys/fiha  
    user  65156      1   0 08:50:57      -  0:00 /home/s/sys/fiha 
    user  66926      1   0 08:50:57      -  0:00 /home/s/sys/fiha  
    user  67088      1   0 08:50:57      -  0:00 /home/s/sys/fiha  
    user  67470      1   0 08:50:57      -  0:00 /home/s/sys/fiha  
    user  68270      1   0 08:50:57      -  0:00 /home/s/sys/fiha  
    user  68366      1   0 08:50:57      -  0:36 /home/s/sys/fiha 
    user  68980      1   0 08:50:57      -  0:00 /home/s/sys/fiha  
    user  72298      1   0 08:50:57      -  0:05 /home/s/sys/fiha  
ce9888$ echo $?
0

It reacts as you suggest, since grep -v did find the "grep" string.

Code:
ce9888$ ps -ef | grep -i fiha | grep -v toto
  ce9888  36474  50948   1 11:08:21 pts/12  0:00 grep -i fiha 
    spsy  37558      1   0 08:50:57      -  0:00 /home/s/sys/fiha
    spsy  56818      1   0 08:50:57      -  0:00 /home/s/sys/fiha 
    spsy  65156      1   0 08:50:57      -  0:00 /home/s/sys/fiha 
    spsy  66926      1   0 08:50:57      -  0:00 /home/s/sys/fiha 
    spsy  67088      1   0 08:50:57      -  0:00 /home/s/sys/fiha  
    spsy  67470      1   0 08:50:57      -  0:00 /home/s/sys/fiha  
    spsy  68270      1   0 08:50:57      -  0:00 /home/s/sys/fiha  
    spsy  68366      1   0 08:50:57      -  0:37 /home/s/sys/fiha  
    spsy  68980      1   0 08:50:57      -  0:00 /home/s/sys/fiha  
    spsy  72298      1   0 08:50:57      -  0:06 /home/s/sys/fiha  
ce9888$ echo $?
0

Accordingly to your assumption this one should have return 1 since grep -v didn't found the "toto" string. which its not the case...
 

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