awk script giving unstable results

Shell Programming and Scripting
1

Hi all

Here I came accross a situation which i am unable to reason out...

snippet 1

 
psg ServTest | grep -v "grep" | grep -v "vi" | awk '{
     pgm_name=$8
     cmd_name="ServTest"
     gsub(/[[:space:]]*/,"",pgm_name)
     if(pgm_name==cmd_name) { print "ServTest Present =" cmd_name}
}'
Output is 
awk
ServTest not running! = ServTest
 anteus 12576 12572  1 05:31:52 pts/t41   0:00 awk {
ServTest not running! = ServTest
     pgm_name=$8
ServTest not running! = ServTest
    cmd_name="ServTest"
ServTest not running! = ServTest
gsub(/[[:spa
ServTest Present =ServTest

snippet 2

psg ServTest  | grep -v "grep" | grep -v "vi" | awk '{
     print "Count"
     pgm_name=$8
     cmd_name="ServTest"
     gsub(/[[:space:]]*/,"",pgm_name)
     if(pgm_name==cmd_name) { print "ServTest Running" }
}'
Output is
count
ServTest Running

even if we comment the line print "Count" .the code gives expected output.
snippet 3

 
psg ServTest  | grep -v "grep" | grep -v "vi" | awk '{
     #print "Count"
     pgm_name=$8
     cmd_name="ServTest"
     gsub(/[[:space:]]*/,"",pgm_name)
     if(pgm_name==cmd_name) { print "ServTest Running" }
}'
Output is
ServTest Running

can any one tell me why is this behavior....??

Thanks and Regards

2

print "count" just print the literal string "count".
which shows on the second test

3

yeah that is correct but Why is the code snippet 1 giving different output..

the output of snippet 1 and 3 shoud be same rite?

4

Try the following command :

psg ServTest' | awk '1 ! /vi|awk/ && $8 == "ServTest" { print "ServTest Present" }'

Can you show us the output of the psg command (the two cases ServTest running and not running).

psg ServTest | grep -v "grep" | grep -v "vi" | awk '{cmd_name="ServTest"; print}'

Jean-Pierre.

5

When ServTest running
Output

 
awk
ServTest not running! = ServTest
 s0lawre  3408  3404  1 00:06:33 pts/t8    0:00 awk {
ServTest not running! = ServTest
     pgm_name=$8
ServTest not running! = ServTest
    cmd_name="ServTest"
ServTest not running! = ServTest
gsub(/[[:spa
ServTest Present =ServTest

When ServTest not Running
Output

 
awk
ServTest not running! = ServTest
 s0lawre  3566  3562  1 00:07:41 pts/t8    0:00 awk {
ServTest not running! = ServTest
     pgm_name=$8
ServTest not running! = ServTest
    cmd_name="ServTest"
ServTest not running! = ServTest
gsub(/[[:spa

I am not looking for an alternative solution for this script.
just want to know why code snippet 1 and 3 gives diff results?

Thanks
Anteus

6

Try:

psg ServTest' | awk '! /vi|awk/ && $8 == "ServTest" { print "ServTest Present" }'
7 
 
syntax error at line 2 : `'' unmatched
8 
psg ServTest | awk '! /vi|awk/ && $8 == "ServTest" { print "ServTest Present" }'

jean-Pierre.

9

Why is code snippet 1 and 3 giving different output.?
Can anyone tell me this.

Thanks and Regards.

10

Please show us the result of the psg command, add a debug print instruction in the awk scripts

snippet 1

psg ServTest | grep -v "grep" | grep -v "vi" | awk '1 {printf "debug -", $0 } {
     pgm_name=$8
     cmd_name="ServTest"
     gsub(/[[:space:]]*/,"",pgm_name)
     if(pgm_name==cmd_name) { print "ServTest Present =" cmd_name}
}'

snippet 2:

psg ServTest  | grep -v "grep" | grep -v "vi" | awk '1 {printf "debug -", $0 } {
     print "Count"
     pgm_name=$8
     cmd_name="ServTest"
     gsub(/[[:space:]]*/,"",pgm_name)
     if(pgm_name==cmd_name) { print "ServTest Running" }
}'

Jean-Pierre.

11

snippet 1

psg ServTest | grep -v "grep" | grep -v "vi" | awk '1 {printf "debug -", $0 } {
     pgm_name=$8
     cmd_name="ServTest"
     gsub(/[[:space:]]*/,"",pgm_name)
     if(pgm_name==cmd_name) { print "ServTest Present =" cmd_name}
}'

Result debug -ServTest Present =ServTest

snippet 2:

psg ServTest  | grep -v "grep" | grep -v "vi" | awk '1 {printf "debug -", $0 } {
     print "Count"
     pgm_name=$8
     cmd_name="ServTest"
     gsub(/[[:space:]]*/,"",pgm_name)
     if(pgm_name==cmd_name) { print "ServTest Running" }
}'

Result
debug -count
ServTest Running

-----
and this is my code and its output

psg ServTest| grep -v "grep" | grep -v "vi" | awk '{
print "count"
pgm_name=$8
cmd_name="ServTest"
gsub(/[[:space:]]*/,"",pgm_name)
if(pgm_name==cmd_name)
{
  print "ServTest Present =" cmd_name
}
}'

count
count
count
count
count
count
ServTest Present =ServTest

can u please explain me why is count being printed 6 time instead of one.