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Full Discussion: Get previous and next line
Top Forums Shell Programming and Scripting Get previous and next line Post 302353287 by sunpraveen on Tuesday 15th of September 2009 04:23:17 AM
Old 09-15-2009
Try this:

INPUT FILE:
Code:
$ cat file.txt
NAME
ADDRESS
NO
NAME
OTHER
NEW
OP
NAME
FEW
OTHER
NEW
NAME


SHELL SCRIPT:
Code:
 
$ cat file1
grep -n "NAME" file.txt | cut -d ':' -f1 > /tmp/occurance_lines.txt
i=1
while read line
do
  if [[ ${i} -gt 3 ]]; then
    break
  fi
  line1=$(( ${line} - 1 ))
  if [[ line1 -ne 0 ]]; then
    tail +${line1} file.txt | head -1 >> /tmp/output.txt
  fi
  line2=$(( ${line} + 1 ))
  tail +${line2} file.txt | head -1 >> /tmp/output.txt
  i=$(( ${i} + 1 ))
done < /tmp/occurance_lines.txt
cat /tmp/output.txt
rm -f /tmp/occurance_lines.txt /tmp/output.txt

OUTPUT:
Code:
 
$ ./file1
ADDRESS
NO
OTHER
OP
FEW

HTH,Smilie


Regards,

Praveen
 

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LEARN ABOUT DEBIAN

grcompiler

grcompiler(1)															     grcompiler(1)

NAME

       grcompiler - Compile GDL into a TrueType Font

SYNOPSIS

       grcompiler [-d] [-D] [-g] [-n number] [-v number] [-w number] [-wall] [-q] gdl-file font-file [output-file] [output-fontname]

Description
       Grcompiler  compiles  a	Graphite Description Language description of the smarts for a font along with a TrueType Font to create a graphite
       font with graphite tables in it.

       -d     Generate XML debugger file.

       -D     Generate all debugger files.

       -g     Permit and ignore invalid glyph definitions.

       -nnumber
	      Set name table start location.

       -q     Quiet mode (no messages except on error).

       -vnumber
	      Set Silf table version number.

       -wnnnn Ignore warning with the given number. This option may be repeated.

       -wall  Display all warnings.

Environment
       grcompiler makes use of the following environment variables

       GDLPP  Specifies the command to execute to run the GDL preprocessor

Files
       gdlerr.txt
	      Warnings and errors are output to this file.

       dbg_classes.txt
	      Debug file that specifies the classes stored in the font in terms of their GDL source and containing glyph ids in hex.

       dbg_cmap.txt
	      Debug file giving Unicode to glyph mapping of all the glyphs in the font and vice versa.

       dbg_enginecode.txt
	      Debug file containing the action code and constraint code associated with each pass and rule in a pass.

       dbg_fsm.txt
	      Debug file that gives the finite state machines of each pass and the rules referenced. For each pass, a  mapping	is  given  between
	      glyph and column number.

       dbg_glyphattrs.txt
	      Debug file containing all the glyph attributes and their names, along with values specified for each glyph.

       dbg_parsetree.txt
	      Debug file giving the complete parse tree of the GDL source file.

       dbg_ruleprec.txt
	      Debug file that lists the rules in precedence order (order in which they will be tested) for each pass.

       $_temp.gdl
	      Debug file containing the output of gdlpp

Author
       Martin Hosken <mhosken@users.sourceforge.net>

							   $Date: 2012-05-29 11:36:50 $ 					     grcompiler(1)
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