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Full Discussion: To display 10 lines before and after the error
Top Forums Shell Programming and Scripting To display 10 lines before and after the error Post 302795329 by Corona688 on Wednesday 17th of April 2013 02:44:15 PM
Old 04-17-2013
Some systems let you use -B with grep to get context, but odds are good you don't have that. you can use an awk script:

Code:
$ cat context.awk
# Recall N lines ago up to 19 lines
function last(N)
{
        if(N>L) return("");
        return(LINE[(L-N)%20]);
}

{ LINE[(++L)%20]=$0 } # Remember line for later

/Apr 8/ && /ERROR/  {
        for(N=10; N>=0; N--) print last(N);
        for(N=1; N<=9; N++) { getline ; print }
}

$ awk -f context.awk logfile

Use nawk on solaris.
Last edited by Corona688; 04-17-2013 at 04:12 PM..
This User Gave Thanks to Corona688 For This Post:
ajothi
 

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LEARN ABOUT CENTOS

pagesize

PAGESIZE(1)						      General Commands Manual						       PAGESIZE(1)

NAME

       pagesize - Print supported system page sizes

SYNOPSIS

       pagesize [options]

DESCRIPTION

       The  pagesize utility prints the page sizes of a page of memory in bytes, as returned by getpagesizes(3). This is useful when creating por-
       table shell scripts, configuring huge page pools with hugeadm or launching applications to use huge pages with hugectl.

       If no parameters are specified, pagesize prints the system base page size as returned by getpagesize().	The  following	parameters  affect
       what other pagesizes are displayed.

       --huge-only, -H

	      Display all huge pages supported by the system as returned by gethugepagesizes().

       --all, -a

	      Display all page sizes supported by the system.

SEE ALSO

       oprofile(1), getpagesize(2), getpagesizes(3), gethugepagesizes(3), hugectl(7), hugeadm(7), libhugetlbfs(7)

AUTHORS

       libhugetlbfs was written by various people on the libhugetlbfs-devel mailing list.

								 October 10, 2008						       PAGESIZE(1)
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