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Full Discussion: Shell Script to replace text
Top Forums Shell Programming and Scripting Shell Script to replace text Post 302396963 by joebaber on Saturday 20th of February 2010 01:54:46 AM
Old 02-20-2010
Thanks for the reply.

The files to be replaced aren't necessarily .txt files. For example, one time running the script, I may want to replace a variety of .txt and .dat files, another time I may want to only want to replace .dat files or .txt files, etc.

The code I have now does replace the text successfully in all the files I specify. However, I want the files to not be touched/modified if grep does not find the string of text in the file.

---------- Post updated at 01:54 AM ---------- Previous update was at 01:37 AM ----------

I figured out what I was doing wrong. The $SEARCH variable shouldn't have been set as a global variable. It should have been within the "if" loop, such as:

Code:
#!/bin/sh

p1=$1
p2=$2

while [ ! -z "$3" ]
do
  SEARCH=`grep $p1 $3 | wc -l`
  if [ $SEARCH -ge 1 ]
  then
    mv $3 $3.bak
    sed -e "s/$p1/$p2/g" $3.bak > $3
    shift
  else
    shift
  fi
done

Last edited by Franklin52; 02-20-2010 at 07:43 AM.. Reason: Please use code tags!!
 

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LEARN ABOUT LINUX

zegrep

ZGREP(1)                                                      General Commands Manual                                                     ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep  options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

                                                                                                                                          ZGREP(1)
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