Check Variable Value in File and Replace If Needed Bash Script -

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this question related post: setting variables value in file in different directory using loops , sed bash script

i'm looking way check variable value in file , update needed. change value following: 

#!/bin/bash  cd '/home/me/' source server.properties server_var="$server_name" echo "$server_var" echo "$application_name" if [ "$server_var" != "server1" ];     echo "uncorrect value"     sed -i -e 's@server_name=$server_var@server_name=server1@g' server.properties fi cd '/home/test/'

thank suggestion, if statement work, sed command doesnt update variable value in file. can please point me in right direction regarding issue?

thank you, 

if [ -n "$server_name" ]     sed ... fi

btw, don't think set command can set $server_name. set $1, $2, etc.


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