Shell Programming and Scripting

portsuf=25
port=20925

$ echo "port=20925" | awk  'sub(substr($1,7,2),portsuf,$1)' portsuf=25
port=22525

$ echo "port=20925" | awk  '{print substr($1,1,6) portsuf substr($1,9)}' portsuf=25
port=22525

$ echo "port=20925" | sed 's/09/25/g'
port=22525

#!/bin/bash

line=leprechaun.host.uri.list=raft://rt930test.info53.com:23025
echo $line
printf "Enter New Port : "
read port
line=$(echo $line | awk -F":" 'sub(substr($NF,2,2),newport,$NF)' OFS=":" newport=$port)
echo $line

$ bash test.sh
leprechaun.host.uri.list=raft://rt930test.info53.com:23025
Enter New Port : 25
leprechaun.host.uri.list=raft://rt930test.info53.com:22525

$ bash test.sh
leprechaun.host.uri.list=raft://rt930test.info53.com:23025
Enter New Port : 99
leprechaun.host.uri.list=raft://rt930test.info53.com:29925