Bash shell script shopt command sample

#!/bin/bash

## Before enabling xpg_echo
echo "welcome to\n"
echo "shell script training\n"
shopt -s  xpg_echo
## After enabling xpg_echo
echo "welcome to\n"
echo "shell script training\n"

# Before disabling aliases
alias l.='ls -l .'
l.

# After disabling aliases
shopt -u expand_aliases
l.