Script to Replace a Word

Script to Replace a Word

This script will help you to understand how to replace a word in a file...........
Now we are going to replace "ONBOOT=no" to "ONBOOT=yes" in the file /etc/sysconfig/network-scripts/ifcfg-eth0.....
Create a file




#vi test.sh

#!/bin/bash
OLD="ONBOOT=no"
NEW="ONBOOT=yes"
DPATH="/etc/sysconfig/network-scripts/ifcfg-eth0"
for f in $DPATH
do
if [ -f $f -a -r $f ]; then
        sed "s/$OLD/$NEW/g" "$f"
else
        echo "Error: Cannot read $f"
fi
done


:wq!  ------------>   save and exit file

#chmod   u+x    test.sh  ------------> give excute permission


# /root/test.sh  -----------> run the script


You can also use the below command to complete the above task









or use the command
perl -p -i -e 's/ONBOOT=no/ONBOOT=yes/g;' /etc/sysconfig/network-scripts/ifcfg-eth0