Execute commands on multiple hosts using ssh

#!/bin/bash
# Linux/UNIX box with ssh key based login
SERVERS=”192.168.1.1 192.168.1.2 192.168.1.3″

# SSH User name
USR=”jadmin”

# Email
SUBJECT=”Server user login report”
EMAIL=”admin@somewhere.com”
EMAILMESSAGE=”/tmp/emailmessage.txt”

# create new file
>$EMAILMESSAGE

# connect each host and pull up user listing
for host in $SERVERS

do
echo “——————————–” >>$EMAILMESSAGE
echo “* HOST: $host ” >>$EMAILMESSAGE
echo “——————————–” >>$EMAILMESSAGE

ssh $USR@$host w >> $EMAILMESSAGE

done

# send an email using /bin/mail
/bin/mail -s “$SUBJECT” “$EMAIL” < $EMAILMESSAGE
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