Shell-script - Search string and add in file, Add data in the file

Search string and add in file

The below script helps you to search a string and add it in to the file, if the string is not found in it. Here in the below script we search for a ipaddress is found on the server or not, it the Ip address is found then the script will not add ipaddress into the file. Else it will add it in the file

Assume that you have a file called server_name and it has list of hostname or server name in it.

 server-1
 server-2
 server-3
 server-4
 server-5

#!/bin/bash

file="server_name"
ip="127.0.0.1"
while read line
do
echo "$line"
ssh root@$line  "ff=\$(grep -lr \"$ip\" /etc/hosts)
if (grep -lr \"$ip\" /etc/hosts>/dev/null)
then
echo \"$ip exists!\"
else
echo \"127.0.0.1   localhost  localhost.localdomain\" >> /etc/hosts
fi" <<EOF
EOF
done<"$file"

Execute the script based to search for the ip or sting and add it in multiple hosts.


Ping the server name and fetch its IPAddress

#!/bin/bash

file="server_name"
while read line
do
  echo "#$line" >> result
  out=$(ping -c 2 $line | grep PING | awk '{print $3}' | tr -d '()')
  echo "$out" >> result
done<"$file"

Try to login to multiple servers using below code

#ssh -t -t root@$line <<EOF
#echo "hI.." >> testecho
#EOF
done<"$File"
#ssh root@$i
#<<EOF
#$pass
#echo "hI.."
# put all commands to execute here
#EOF

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