Sed Shell Script To Remove All Blank Spaces From a Text File

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"