lec3vid3

#!/bin/bash

#Display UID and username of the user executing the script 
#Display if the user is root user or not 

#Display UID
echo "your user id is ${UID} and $BASHPID , $HOSTNAME , $OSTYPE" # expands to the user id of the current user ,initialized at shell startup FOR MORE Shell Variables like uid,bashpid 'man bash'

#Display username 
USER_NAME=$(id -un) #instead of $(id -un) we can also give `id -un`
echo "your username is $USER_NAME"

#Display if the user is root user or not 
if [ "${UID}" -eq 0 ] #root always has the uid of 0
then 
  echo "you are root"
else
   echo "you are not root"
fi