# A simple shell script to clean (delete)  ~/.known_hosts file hostname entry.
# This is useful when remote server reinstalled or ssh keys are changed!
# -------------------------------------------------------------------------
# Copyright (c) 2007 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.
# -------------------------------------------------------------------------
[[ $# -eq 0 ]] && { echo "Usage: $0 host.name.com"; exit 1;}
ips=$(host "$host" | awk -F'address' '{ print $2}' | sed -e 's/^ //g')
ssh-keygen -R "$host"
for i in $ips
	ssh-keygen -R "$i"

How Do I Use This Script?

Simply run it as follows:
./script.sh www-03.nixcraft.net.in

🐧 Get the latest tutorials on SysAdmin, Linux/Unix, Open Source, and DevOps topics via:
Category List of Unix and Linux commands
Disk space analyzers ncdu pydf
File Management cat
Firewall Alpine Awall CentOS 8 OpenSUSE RHEL 8 Ubuntu 16.04 Ubuntu 18.04 Ubuntu 20.04
Network Utilities NetHogs 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
1 comment… add one
  • J. E. Aneiros Mar 20, 2012 @ 21:53

    ips=$(host “$host” | awk -F’address’ ‘{ print $2}’ | sed -e ‘s/^ //g’)

    could be shorten to: ips=$(host “$host” | awk ‘/address/ { print $NF }’)

Leave a Reply

Your email address will not be published.

Use HTML <pre>...</pre>, <code>...</code> and <kbd>...</kbd> for code samples.