For user confirmation, is it more standard to use Y or N to denote continuing execution?

1. How to pass yes or no in shell script?
2. What is the purpose of the $? variable?
3. What special variable is used to determine the exit status of a previously executed command?

How to pass yes or no in shell script?

In that case, we can simply wrap our yes/no prompt in a while loop. #!/bin/bash while true; do read -p "Do you want to proceed? (yes/no) " yn case $yn in yes ) echo ok, we will proceed; break;; no ) echo exiting...; exit;; * ) echo invalid response;; esac done echo doing stuff...

What is the purpose of the $? variable?

“$?” is a variable that holds the return value of the last executed command. “echo $?” displays 0 if the last command has been successfully executed and displays a non-zero value if some error has occurred. The bash sets “$?” To the exit status of the last executed process.

What special variable is used to determine the exit status of a previously executed command?

The $? variable represents the exit status of the previous command. Exit status is a numerical value returned by every command upon its completion.