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Full Discussion: find and replace query
Top Forums Shell Programming and Scripting find and replace query Post 302319921 by devtakh on Tuesday 26th of May 2009 01:42:13 PM
Old 05-26-2009
Quote:
Originally Posted by lightdensity
thanks for your response..Actually i am new to shell scripting
Code:
FILE="/opt/server.conf"
NEW_FILE="/opt/new_server.conf"
        
 IFS=""
        for line in `cat ${FILE}`; do
        #echo ${line}
        if [ -n "`echo ${line} | grep 'Server=127.0.0.1'`" ]  #grep command searches for right string
        then
                 echo ${line} | sed 's|Server=127.0.0.1|Server=0.0.0.0|g' >>$NEW_FILE
        elif [ -n "`echo ${line} | grep 'ServerPort=0'`" ]
        then
                echo ${line} | sed 's|ServerPort=0|ServerPort=1|g' >>$NEW_FILE
        elif [ -n "`echo ${line} | grep 'Enable Server=1'`" ]
        then
                echo ${line} | sed 's|Enable Server=1|Enable Server=0|g' >>$NEW_FILE
        else
                echo ${line} >>$NEW_FILE
        fi
        done

So, how to find out which for the right string??

thanks
It will be a waste of resource to use the shell script when sed can handle it. you do not need to check if the word exists and if it exists, then replace it. sed can do that for you.
But incase you need to do..I suggest you use while loop, instead of a for loop with the cat command.

Code:
FILE="/opt/server.conf"
NEW_FILE="/opt/new_server.conf"
        
       while read line
   do
        #echo ${line}
        if [ -n "`echo ${line} | grep 'Server=127.0.0.1'`" ]  #grep command searches for right string
        then
                 echo ${line} | sed 's|Server=127.0.0.1|Server=0.0.0.0|g' >>$NEW_FILE
        elif [ -n "`echo ${line} | grep 'ServerPort=0'`" ]
        then
                echo ${line} | sed 's|ServerPort=0|ServerPort=1|g' >>$NEW_FILE
        elif [ -n "`echo ${line} | grep 'Enable Server=1'`" ]
        then
                echo ${line} | sed 's|Enable Server=1|Enable Server=0|g' >>$NEW_FILE
        else
                echo ${line} >>$NEW_FILE
        fi
        done < $FILE

-Devaraj Takhellambam
 

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