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Full Discussion: Sed command in shell script
Top Forums Shell Programming and Scripting Sed command in shell script Post 302211953 by Todd88 on Saturday 5th of July 2008 11:26:16 AM
Old 07-05-2008
Sed command in shell script
I have a current code working(named subst1) having a user be able to type this line to substitute words using the sed command:

Code:
subst1 old-pattern new-pattern filename

Here is my shell script:

Code:
#!/bin/bash
# subst1

ARGS=3
E_BADARGS=65

if [ $# -ne "$ARGS" ]
then
  echo "Usage: `basename $0` old-pattern new-pattern filename"
  exit $E_BADARGS
fi

old_pattern=$1
new_pattern=$2

if [ -f "$3" ]
then
    file_name=$3
else
    echo "File \"$3\" does not exist."
    exit $E_BADARGS
fi

mv $file_name $file_name.bak
sed -e "s/$old_pattern/$new_pattern/g" $file_name.bak > $file_name

exit 0

The problem with this script is that it changes the date and creates a bak file. I need to alter this script so that when a user inputs the command line, the script checks if the given old-pattern is in the file and if it is, go ahead and do the substitution. If the old-pattern is not found, the script should do nothing. Any help would be appreciated!
 

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LEARN ABOUT DEBIAN

xpat

XPAT(1) 						     ALLIANCE Reference Manual							   XPAT(1)

NAME

       xpat - graphic pattern viewer

SYNOPSIS

       xpat [-l file_name] [-xor] [-install] [-force]

ORIGIN

       This  software  belongs	to  the  ALLIANCE CAD SYSTEM developed by the ASIM team at LIP6 laboratory of Universite Pierre et Marie CURIE, in
       Paris, France.

       Web : http://asim.lip6.fr/recherche/alliance/
       E-mail : alliance-users@asim.lip6.fr

DESCRIPTION

       Xpat is a pattern viewer. All functionnalities can be accessed through different menus.	Xpat works under Motif and X11r6.   When  entering
       Xpat,  the  main window appears and shows 5 different menus on the top bar. These menus can be entered by simply clicking on the mouse left
       button. Here is the description of these menus.

       File	 Open : load an existing pattern file (see pat(5)).
		 Quit : quit xpat.

       Edit	 Identify : identify a selected pattern.
		 Connected : highlight a selected pattern.
		 Search : search a pattern.

       View	 Zoom : perform zoom in, zoom out, center, fit, refresh on figure.
		 Layer : select types of layers displayed.
		 Map : show cursor position in the entire figure.
		 Arrows : show arrows for moving at the grid step.
		 Grid : Set the X,Y step of the grid if displayed.

       Tools	 Message : display the last error messages

       Setup	 Save or load a user defined configuration of default displayed menus.

SPECIAL KEYS

       +/-    Increase or decrease the time scale.

OPTIONS

       -l file_name
	      Load the pattern file file_name (without extention .pat)

       -xor   Two graphic cursor methods can be used, invert or xor.

       -force this option force all graphical objects to be displayed.

       -install
	      Switch to a private color map.

ENVIRONMENT VARIABLES

       MBK_WORK_LIB
	      indicates the path to the read directory for the session.

       XPAT_PARAM_NAME (optionnal)
	      indicates the path to the parameter file used by Xpat.

       SEE ALSO
	      mbk(1), MBK_WORK_LIB(1), PAT(5), asimut(1)

BUG REPORT

       This tool is under development at the ASIM department of the LIP6 laboratory.
       We need your feedback to improve documentation and tools.

ASIM
/LIP6							 September 1, 2000							   XPAT(1)
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