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Full Discussion: Getting info from a huge log file
Top Forums Shell Programming and Scripting Getting info from a huge log file Post 302554385 by yazu on Sunday 11th of September 2011 11:18:53 PM
Old 09-12-2011
"Grepping" in awk for time is just optimization. If it doesn't work - remove it. And if you have other filed separator, "main" and "trigger" regexes, just change them:
Code:
fs=':\\| +'; main='RBL: '; trig='BIOS-INFO'
awk  -F"$fs" -v main="$main" -v trig="$trig" '
$2 ~ main {
   first = $0; getline; second = $0; getline; third = $0;
}
first && $2 ~ trig {       
  printf "%s\n%s\n%s\n", first, second, third
  exit
}' INPUTFILE

===

Remember about optimization - embedding shell variables and changing dynamical regexes to static ones. But they say it's unsafe and if you are going to write a script that will get these parameters from the command line - it's very unsafe. It's possible to embed in a such parameter any shell command and execute it (though you can validate them).
Last edited by yazu; 09-12-2011 at 12:36 AM..
 

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LEARN ABOUT DEBIAN

petitboot-nc

petitboot-nc(8) 					    BSD System Manager's Manual 					   petitboot-nc(8)

NAME

     petitboot-nc -- Petitboot ncurses bootloader UI

SYNOPSIS

     petitboot-nc [-d, --start-daemon] [-h, --help] [-l, --log log-file] [-V, --version]

DESCRIPTION

     petitboot-nc is an ncurses based interface to the Petitboot bootloader.

     Petitboot is a Linux kexec based bootloader that supports loading Linux kernel and initrd images from any device that can be mounted by
     Linux.  It can also load images from the network using the HTTP, HTTPS, NFS, SFTP, and TFTP protocols.

OPTIONS

     -d, --start-daemon
	     Start pb-discover, the petitboot dynamic device discovery daemon, if it has not been started.  This option is mainly useful when run-
	     ning petitboot as a stand-alone application.

     -h, --help
	     Print a help message.

     -l, --log log-file
	     Log messages to the file log-file.  The default log is a file /var/log/petitboot-nc.log.  New messages are appended to an existing
	     log file.

     -V, --version
	     Display the program version number.

SEE ALSO

     petitboot(8), petitboot-twin(8), pb-discover(8), pb-event(8)

REPORTING BUGS

     Send bug reports to Geoff Levand <geoff @ infradead.org>

BSD
								   June 1, 2019 							       BSD
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