But I'm afraid the above awk solution would be slow because of the string regex. But you can embed the time variable (you need a variable for easy further automation) in the awk regex literal:
Upon reading that, I was skeptical. I expected that there would be an improvement, but I didn't think it would be a large difference. Wow, was I mistaken.
Test file generation:
Trying to match lines that begin with "foo", that yields a 10 million line file whose lines alternately match and don't match.
The regular expression literal (4.738) is 38% faster than the dynamic regular expression (7.680).
I measured similar results (41% improvement) with an ancient version of mawk on a 12 yr old laptop (which still has a sticker proudly announcing "Designed for Microsoft Windows 95").
I've got a 2.2 Gig syslog file from our Cisco firewall appliance. The problem is that we've been seeing gaps in the syslog for anywhere from 10 minutes to 2 hours. Currently I've just been using 'less' and paging through the file to see if I can find any noticeable gaps. Obviously this isn't the... (3 Replies)
I have a file with data extracted, and need to insert a header with a constant string, say: H|PayerDataExtract
if i use sed, i have to redirect the output to a seperate file like
sed ' sed commands' ExtractDataFile.dat > ExtractDataFileWithHeader.dat
the same is true for awk
and... (10 Replies)
Looking for a shell script or a simple perl script . I am new to scripting and not very good at it .
I have 2 directories . One of them holds a text file with list of files in it and the second one is a daily log which shows the file completion time. I need to co-relate both and make a report.
... (0 Replies)
Hi,
I have a log file that contains information such as this:
date
id number
command1
command2
command3
command4
data
data
data
date
id number
command1
command2
command3
command4 (4 Replies)
Hi Experts,
I had to edit (a particular value) in header line of a very huge file so for that i wanted to search & replace a particular value on a file which was of 24 GB in Size. I managed to do it but it took long time to complete. Can anyone please tell me how can we do it in a optimised... (7 Replies)
My intention is to log the output to a file as well as it should be displayed on the console > I have used tee ( tee -a ${filename} ) command for this purpose. This is working as expected for first few outputs, after some event loggin nothing is gettting logged in to the file but It is displaying... (3 Replies)
I have a LOG file which looks like this
Import started at: Mon Jul 23 02:13:01 EDT 2012
Initialization completed in 2.146 seconds.
--------------------------------------------------------------------------------
--
Import summary for Import item: PolicyInformation... (8 Replies)
unix : sun
shell : bash
i need to select multiple rows with this format :
<special format>
10 lines
/<special format>
from log file that have lots of info
i thought of getting the number of the first line using
grep -n "special format" file | cut -d: -f1
then pass it to shell... (2 Replies)
Hi
I have a system running uname -a
Linux cmovel-db01 2.6.32-38-server #83-Ubuntu SMP Wed Jan 4 11:26:59 UTC 2012 x86_64 GNU/Linux
I would like to capture the contents of /var/log/syslog from 11:00AM to 11:30AM and sent to this info via email.
I was thinking in set a cron entry at that... (2 Replies)
Discussion started by: fretagi
2 Replies
LEARN ABOUT REDHAT
igawk
IGAWK(1) Utility Commands IGAWK(1)NAME
igawk - gawk with include files
SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ...
igawk [ all gawk options ] [ -- ] program-text file ...
DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).
AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like
@include getopt.awk
in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.
OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports.
EXAMPLES
cat << EOF > test.awk
@include getopt.awk
BEGIN {
while (getopt(ARGC, ARGV, "am:q") != -1)
...
}
EOF
igawk -f test.awk
SEE ALSO gawk(1)
Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.
AUTHOR
Arnold Robbins (arnold@skeeve.com).
Free Software Foundation Nov 3 1999 IGAWK(1)