Shell Script To Update Remote RHEL and CentOS Servers Over SSH Session

# A simply shell script to update all remote Redhat Enterprise Linux 5 / CentOS Linux 5 servers
# You must have ssh public and private key installed. This will save a lot of time if you
# have 5-7 servers. The last example shows how to login as a normal user and run sudo 
# to update the same.
# -------------------------------------------------------------------------
# Copyright (c) 2008 nixCraft project <>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit for more information.
# -------------------------------------------------------------------------
# an array to store all ssh commands
	"ssh -p222 yum update -y"
	"ssh -p333 yum update -y"
	"ssh yum update -y"
	"ssh user1@ -t sudo  '/usr/bin/yum update -y' "
# simply run array item
for c in "${hosts[@]}"

See how to install ssh-keys .

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2 comments… add one
  • imagine1437 May 12, 2010 @ 2:01

    Thanks. This is very helpful

  • Vamsi Feb 28, 2010 @ 12:31

    thanks for the script ..
    arrays are very useful :D

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