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Top Forums Shell Programming and Scripting Modify one line in a plain text file Post 302760199 by Xedrox on Wednesday 23rd of January 2013 02:57:53 PM
Old 01-23-2013
Modify one line in a plain text file

Hi everyone,

I want to know, if there is a way to modify one line in a text file with unix script, with out re-writing all the file.

For example, i have this file:

Code:
CONFIGURATION_1=XXXX
CONFIGURATION_2=YYYY
CONFIGURATION_3=ZZZZ

supose i have a command or function "modify" that takes a file and modficates one line. "Modify" takes two arguments, the number of the line and the new value.

Code:
#script
modify 2 CONFIGURATION_2=XXXX

The result that i want on the file:

Code:
CONFIGURATION_1=XXXX
CONFIGURATION_2=XXXX
CONFIGURATION_3=ZZZZ

Thanks!

Sorry for my bad english.

Last edited by joeyg; 01-24-2013 at 01:11 PM.. Reason: Corrected title spelling
 

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PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME
paps - UTF-8 to PostScript converter using Pango SYNOPSIS
paps [options] files... DESCRIPTION
paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves through the pango ft2 backend. OPTIONS
These programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is included below. --landscape Landscape output. Default is portrait. --columns=cl Number of columns output. Default is 1. Please notice this option isn't related to the terminal length as in a "80 culums terminal". --font=desc Set the font description. Default is Monospace 12. --rtl Do right to left (RTL) layout. --paper ps Choose paper size. Known paper sizes are legal, letter and A4. Default is A4. Postscript points Each postscript point equals to 1/72 of an inch. 36 points are 1/2 of an inch. --bottom-margin=bm Set bottom margin. Default is 36 postscript points. --top-margin=tm Set top margin. Default is 36 postscript points. --left-margin=lm Set left margin. Default is 36 postscript points. --right-margin=rm Set right margin. Default is 36 postscript points. --gutter-width=gw Set gutter width. Default is 40 postscript points. --help Show summary of options. --header Draw page header for each page. --markup Interpret the text as pango markup. --lpi Set the lines per inch. This determines the line spacing. --cpi Set the characters per inch. This is an alternative method of specifying the font size. --stretch-chars Indicates that characters should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops behaviour. AUTHOR
paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>. This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others). April 17, 2006 PAPS(1)
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