commands: type -a ls (o/p: ls is /bin/ls)
history => history is a shell built-in command
the file with above content and give +x permission using "chmod +x
tesh.sh" and execute using "./test.sh"
line is called "shebang" or a "bang" line.
and printing variables:
"Enter your name:"
"Thank you $NAME"
above script NAME is a variable. read is used to get INPUT from the user
and store it in variable NAME and print the value using $NAME