sed (Stream EDitor) a Unix utility which parses text files and implements a programming language which can apply textual transformations to such files. It reads input files line by line (sequentially), applying the operation which has been specified via the command line (or a sed script), and then outputs the line.
The following example shows a typical use of sed:
#!/bin/bash # Write a shell script which reads the contents in a text file and removes # all the blank spaces in them and redirects the output to a file. # ------------------------------------------------------------------------- # Copyright (c) 2001 nixCraft project <http://cyberciti.biz/fb/> # This script is licensed under GNU GPL version 2.0 or above # ------------------------------------------------------------------------- # This script is part of nixCraft shell script collection (NSSC) # Visit http://bash.cyberciti.biz/ for more information. # ------------------------------------------------------------------------- out="output.$$" echo -n "Emter a file name : " read file if [ ! -f $file ] then echo "$file not a file!" exit 1 fi sed -e 's/[\t ]//g;/^$/d' $file > $out echo "Output written to $out file"
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echo “eth0 192.168.12.2″|awk ‘{print $2}’
sed -e ‘s/[\t ]//g;/^$/d’ $file
It also delete t character if given in file.
How does it remove double space?
Thanks, Very useful script.. How to remove a particular word say etho
eth0 192.168.12.2
eth0 192.168.1.41
want to remove eth0 from above line
echo “eth0 192.168.12.2″ | cut -d” ” -f2
will work as well