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Full Discussion: Select matches between line number and end of file?
Top Forums Shell Programming and Scripting Select matches between line number and end of file? Post 302074518 by Jerrad on Tuesday 23rd of May 2006 06:41:51 PM
Old 05-23-2006
Select matches between line number and end of file?
Hi Guys/Gals,

I have a log file that is updated once every few seconds and I am looking for a way to speed up one of my scripts.

Basically what I am trying to do is grep through a text file from start to finish once. Then each subsequent grep starts at the last line of the previous grep to the end of the file.

The log file can get as large as 200MB and rather then going through the file start to finish every time, I want to be able to have the second grep start off where the last grep finished, cutting down on processing time.

I tried to use tail to grab the last x amount of lines of the file which is much faster, but the issue is the file keeps being updated constantly so the last 100 lines is only valid for about 3 seconds, until a new line gets appended to the log file.

Is there a command to tail line 100101 to end_of_file?

I figured I could determine the last line number by using something like this
cat -n logfile.txt | tail -n1 | gawk "{print $1}" > lastline.txt

If anyone has a suggestion on how to accomplish this, please share your thoughts.

Thanks

Jerrad
 

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LEARN ABOUT SUSE

startpar

STARTPAR(8)						      System Manager's Manual						       STARTPAR(8)

NAME

       startpar - start runlevel scripts in parallel

SYNOPSIS

       startpar [-p par] [-i iorate] [-t timeout] [-T global_timeout] [-a arg] prg1 prg2 ...
       startpar [-p par] [-i iorate] [-t timeout] [-T global_timeout] -M [ boot|start|stop]

DESCRIPTION

       startpar  is  used  to run multiple run-level scripts in parallel.  The degree of parallelism on one CPU can be set with the -p option, the
       default is full parallelism. An argument to all of the scripts can be provided with the -a option.  Processes block  by	pending  I/O  will
       weighting by the factor 800.  To change this factor the option -i can be used to specify an other value.

       The  output  of	each  script is buffered and written when the script exits, so output lines of different scripts won't mix. You can modify
       this behaviour by setting a timeout.

       The timeout set with the -t option is used as buffer timeout. If the output buffer of a script is not empty and the last output was timeout
       seconds ago, startpar will flush the buffer.

       The  -T option timeout works more globally. If no output is printed for more than global_timeout seconds, startpar will flush the buffer of
       the script with the oldest output. Afterwards it will only print output of this script until it is finished.

       The -M option switches startpar into a make(1) like behaviour.  This option takes three different arguments:  boot,  start,  and  stop  for
       reading .depend.boot or .depend.start or .depend.stop respectively in the directory /etc/init.d/.  By scanning the boot and runlevel direc-
       tories in /etc/init.d/ it then executes the appropriate scripts in parallel.

FILES

       /etc/init.d/.depend.boot
       /etc/init.d/.depend.start
       /etc/init.d/.depend.stop

SEE ALSO

       init.d(7), insserv(8), startproc(8).

COPYRIGHT

       2003,2004 SuSE Linux AG, Nuernberg, Germany.
       2007 SuSE LINUX Products GmbH, Nuernberg, Germany.

AUTHOR

       Michael Schroeder <mls@suse.de>
       Takashi Iwai <tiwai@suse.de>
       Werner Fink <werner@suse.de>

								     Jun 2003							       STARTPAR(8)
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