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Top Forums Shell Programming and Scripting search for an expression in a file and print the 3 lines above it Post 302419301 by avatar_007 on Thursday 6th of May 2010 08:26:05 PM
Old 05-06-2010
search for an expression in a file and print the 3 lines above it

Hi,

I have a file like this

comment.txt
Code:
1.img
2.img
3.img
OK
x.img
y.img
z.img
not ok
1.img
2.img
3.img
bad
1.img
 2.img
 3.img
 OK

i want to print the 3 lines above if the 4th line dose not contain 'OK'

some thing like the following to get an idea.
awk 'NR%4 !~ /OK/ {print $(NR-3)"\n"$(NR-2)"\n"$(NR-1)}' comment.txt


Thanks
 

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img-bmp(3tk)															      img-bmp(3tk)

NAME
img-bmp - Img, Windows Bitmap Format (bmp) SYNOPSIS
package require Tk package require img::bmp ?1.3? image create photo ?name? ?options? DESCRIPTION
The package img::bmp is a sub-package of Img. It can be loaded as a part of the complete Img support, via package require Img, or on its own, via package require img::bmp. Like all packages of Img it does not provide new commands, but extends the existing Tk command image so that it supports files containing raster images in the Windows Bitmap Format (bmp). More specifically img::bmp extends Tk's photo image type. The name of the new format handler is bmp. This handler does not provide additional configuration options. All of the above means that in a call like image create photo ?name? ?options? [1] Image data in bmp format (options -data and -file) is detected automatically. [2] The format name bmp is recognized by the option -format. SEE ALSO
img-bmp, img-gif, img-ico, img-intro, img-jpeg, img-pcx, img-pixmap, img-png, img-ppm, img-ps, img-sgi, img-sun, img-tga, img-tiff, img- window, img-xbm, img-xpm KEYWORDS
bmp, image handling, tk COPYRIGHT
Copyright (c) 1995-2003 Jan Nijtmans <nijtmans@users.sourceforge.com> Img 1.3 img-bmp(3tk)
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