Need to create shell script that finds a phrase and then prints the line right above that phrase to another file

Posted on 2003-11-26
Last Modified: 2010-04-17
I need to create a shell script (or perl) that will search a given logfile for a particular phrase and then copy the date and time of which is just above the occurance of the phrase.


Verification Startup is completed
Welcome to the Dialogue
11/26/2003;10:32:11 Transition started
11/26/2003;10:32:14 Manipulation error shutdown completed
Verification Startup is completed
Welcome to the Dialogue

Given the logfile above I need to write another file that will contain this:

Startup times

Please help, thanks. I am writing this in an HP9000 machine. Unix.

Question by:jporgy
  • 3

Author Comment

ID: 9829519
This is a unix perl or shell script programming
LVL 45

Expert Comment

ID: 9829597
echo Startup times > output_file_name
grep "string_to_search" log_file_name | awk ' { print $1 " " $2 } ' >> output_file_name
LVL 24

Accepted Solution

shivsa earned 125 total points
ID: 9829628

require Exporter;

my ( $line_no,

$line_no = 0;
print "Verification Startup \n";
@aa = ();
@aa = `cat /tmp/historydmp.txt`;
while ($line_no < @aa ){
$one_line = @aa[$line_no];
$true = grep /Verification/, $one_line ;
if ( $true == 1) {
print "@aa[$line_no-1] \n";
$line_no = $line_no + 1;

Author Comment

ID: 10319901
shivsa's answer is okay.

Author Comment

ID: 10319907
My html screen is screwed, can the moderator award the answer to shivsa'?

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