Problem with Shell Scripts deleting text in files.
Me and a friend are working on a project, and We have to create a script that can go into a file, and replace all occurances of a certain expression/word/letter with another using Sed. It is designed to go through multiple tests replacing all these occurances, and we don't know what they will be so we have to anticipate anything. We are having trouble on a certain test where we need to replace 'l*' with 'L' in different files using a loop. The code that i have is
Code:
#!/bin/sh
p1="$1" #first parameter
shift
p2="$1"
shift
for file in "$@" #for any file in the directory
do
# A="$1"
#echo $A
#B="$2"
echo "$p1" | sed -e 's/\([*.[^$]\)/\\\1/g' > temporary #treat all special characters as plain text
A="`cat 'temporary'`"
rm temporary
echo "$p1"
echo "$file"
sed "s/$p1/$p2/g" "$file" > myFile.txt.updated #replace occurances
mv myFile.txt.updated "$file"
cat "$file"
done
I have tried testing this on practice files that contain different words and also 'l*' But whenever i test it, it deletes all the text in the file. Can someone help me with this,
Moderator's Comments:
edit by bakunin: For a number of reasons it is imperative for students posting here to use the template provided. This is not the case here.
I am going to close this thread, please create another thread and fill out the template correctly, i will merge it into this thread here and reopen it.
Last edited by bakunin; 08-15-2012 at 03:26 AM..
Reason: Code tags, please...
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LEARN ABOUT DEBIAN
cvsmgdiff
CVSMGDIFF(1) Utility Scripts CVSMGDIFF(1)NAME
cvsmgdiff - uses mgdiff to display differences between any two cvs revisions.
SYNOPSIS
cvsmgdiff [-v|-h|-g gui|-r rev1 [-r rev2]] file ...
DESCRIPTION
This manual page documents briefly the cvsmgdiff program. This manual page was written for the Debian GNU/Linux distribution (but may be
used by others), because the original program does not have a manual page.
This script lets you recursively diff the CVS directories you have checked out. To use, just pass in an optional revision levels and an
optional file directory name. This script then will show you the differences you're interested in.
OPTIONS -v Print version information successfully
-h Print help information
-g gui
Use the program gui as the user interface (default: /usr/bin/mgdiff)
-r revision
Specify the CVS revision to view. If just one -r option is given, view differences between that revision and the current file in the
CVS working directory. If two -r options are given, compare those two revisions with each other.
AUTHOR
cvsmgdiff appears to have been written by Paul Serice. This manual page was written by Ian Zimmerman <itz@speakeasy.org> for the Debian
GNU/Linux project, but may be used by others. It was written with the assistance of pod2man(1).
3rd Berkeley Distribution Utility Scripts CVSMGDIFF(1)
08-14-2012
