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Top Forums Shell Programming and Scripting Grep into a file + show following lines Post 302794117 by Arkadia on Monday 15th of April 2013 07:51:04 AM
Old 04-15-2013
Grep into a file + show following lines

Hi guys,
This is probably very easy but I've no idea how to pull this out.

Basically, I need to find errors into a very large logfile. When you grep the ID, the output is like this:

Code:
 +- Type: 799911 Code:  Ret: 22728954 Mand: X Def:  Des:  UserDes:  SeqNo: 2
  +- Type: 799911 Code:  Ret: 22728954 Mand: X Def:  Des:  UserDes:  SeqNo: 2
  +- Type: 799911 Code:  Ret: 22728954 Mand: X Def:  Des:  UserDes:  SeqNo: 2
  +- Type: 799911 Code:  Ret: 22728954 Mand: X Def:  Des:  UserDes:  SeqNo: 2

Those are multiple occurrences of the same action.
What I need to do is to take only one of these results (because they are identical) and show the next 30 lines in the file, starting from the grep line, to highlight the error.

Is it doable?
Thank you Smilie
 

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

NAME
logsave - save the output of a command in a logfile SYNOPSIS
logsave [ -asv ] logfile cmd_prog [ ... ] DESCRIPTION
The logsave program will execute cmd_prog with the specified argument(s), and save a copy of its output to logfile. If the containing directory for logfile does not exist, logsave will accumulate the output in memory until it can be written out. A copy of the output will also be written to standard output. If cmd_prog is a single hyphen ('-'), then instead of executing a program, logsave will take its input from standard input and save it in logfile logsave is useful for saving the output of initial boot scripts until the /var partition is mounted, so the output can be written to /var/log. OPTIONS
-a This option will cause the output to be appended to logfile, instead of replacing its current contents. -s This option will cause logsave to skip writing to the log file text which is bracketed with a control-A (ASCII 001 or Start of Header) and control-B (ASCII 002 or Start of Text). This allows progress bar information to be visible to the user on the console, while not being written to the log file. -v This option will make logsave to be more verbose in its output to the user. AUTHOR
Theodore Ts'o (tytso@mit.edu) SEE ALSO
fsck(8) E2fsprogs version 1.41.14 December 2010 LOGSAVE(8)
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