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"
Get the latest tutorials on SysAdmin, Linux/Unix, Open Source, and DevOps topics:
- RSS feed or Weekly email newsletter
- Share to Twitter • Facebook • 5 comments... add one ↓
Related Shell Scripts:
Shell Script To Count Vowels, Blank Spaces, Characters, Number of line…- Shell / sed Program To Remove All C and C++ Comments From Program File
Shell / Sed Script To Remove All Comments From C Program
Shell Script To Remove All Keys Belonging To Hostname From a ~/.known_hosts File- Shell Script To Delete All Even Numbered Line From a Text File
Bash shell script to reverse text file contain using Shell array
| Category | List of Unix and Linux commands |
|---|---|
| File Management | cat |
| Firewall | CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04 |
| Network Utilities | dig • host • ip • nmap |
| OpenVPN | CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04 |
| Package Manager | apk • apt |
| Processes Management | bg • chroot • cron • disown • fg • jobs • killall • kill • pidof • pstree • pwdx • time |
| Searching | grep • whereis • which |
| User Information | groups • id • lastcomm • last • lid/libuser-lid • logname • members • users • whoami • who • w |
| WireGuard VPN | CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04 |
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