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"
- RSS feed or Weekly email newsletter
- Share on Twitter • Facebook • 5 comments... add one ↓
Category | List of Unix and Linux commands |
---|---|
File Management | cat |
Firewall | Alpine Awall • 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 | Alpine • 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