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Full Discussion: grep N lines after match and then print them on 1 line each
Top Forums UNIX for Dummies Questions & Answers grep N lines after match and then print them on 1 line each Post 302356672 by varontron on Saturday 26th of September 2009 05:50:25 PM
Old 09-26-2009
Here, this one works:
Code:
#!/bin/sh
# create the output file
touch outputfile
# set the var
COUNT=1
# grep and feed to loop
grep -A 5 TARGET testdata | while read line
do
   # set the line tracking var
   CURRENT=`expr $COUNT % 6`
   if [ 0 -ne $CURRENT ]  # are we on the 6th line?
   then
     # convert newlines to spaces if not the 6th line
     echo $line | tr "\n" " " >> outputfile
   else
     # retain the newline when $COUNT % 6 = 0 -- every 6th line
     echo $line >> outputfile
   fi
   # increment the counter
   COUNT=`expr $COUNT + 1`
done

Last edited by varontron; 09-26-2009 at 06:52 PM.. Reason: added comments to code
 

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LEARN ABOUT LINUX

shuf

SHUF(1) 							   User Commands							   SHUF(1)

NAME

       shuf - generate random permutations

SYNOPSIS

       shuf [OPTION]... [FILE]
       shuf -e [OPTION]... [ARG]...
       shuf -i LO-HI [OPTION]...

DESCRIPTION

       Write a random permutation of the input lines to standard output.

       Mandatory arguments to long options are mandatory for short options too.

       -e, --echo
	      treat each ARG as an input line

       -i, --input-range=LO-HI
	      treat each number LO through HI as an input line

       -n, --head-count=COUNT
	      output at most COUNT lines

       -o, --output=FILE
	      write result to FILE instead of standard output

       --random-source=FILE
	      get random bytes from FILE

       -z, --zero-terminated
	      end lines with 0 byte, not newline

       --help display this help and exit

       --version
	      output version information and exit

       With no FILE, or when FILE is -, read standard input.

AUTHOR

       Written by Paul Eggert.

REPORTING BUGS

       Report shuf bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report shuf translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2010 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The  full documentation for shuf is maintained as a Texinfo manual.  If the info and shuf programs are properly installed at your site, the
       command

	      info coreutils 'shuf invocation'

       should give you access to the complete manual.

GNU coreutils 8.5						   February 2011							   SHUF(1)
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