Thanks for reply. Now I know how chomp working in my above program. I write (extended) my program in another way. Here as you said I used (\s+) instead of "\s".

  my $SMPP_count = int ((split (/\s+/,`cut -d "|" -f 1,10,13 SMSCDR*$date$hour$minute*.log |grep "Submit|GSM" |grep "$hour:$min:$sec" |sort |uniq -c`)) [1]) + int ((split (/\s+/,`cut -d "|" -f 1,10,13 SMSCDR*$date$hour$minute*.log |grep "Submit|SMPP" |grep "$hour:$min:$sec" |sort |uniq -c`)) [1]);

Here the array returning by split contains "NULL" in the 0th position. If you write "(split ..., ...)[0]" its giving the result like 

 
Use of uninitialized value in int at second.pl line 34.
06:20:00= 0     0
Argument "" isn't numeric in int at second.pl line 34.
Argument "" isn't numeric in int at second.pl line 34.
06:20:01= 0     0
Argument "" isn't numeric in int at second.pl line 34.
Argument "" isn't numeric in int at second.pl line 34.
06:20:02= 0     0
Argument "" isn't numeric in int at second.pl line 34.
Argument "" isn't numeric in int at second.pl line 34.
06:20:03= 0     0
Argument "" isn't numeric in int at second.pl line 34.
Argument "" isn't numeric in int at second.pl line 34.
06:20:04= 0     0
Argument "" isn't numeric in int at second.pl line 34.
Argument "" isn't numeric in int at second.pl line 34.
06:20:05= 0     0

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Why the first element in the array is "NULL"????

In reply to Re^2: using system command in regex by ravi45722
in thread using system command in regex by ravi45722

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