Bash Shell Scripting - Other Shell Variables - Part 1

The video tutorial covers special variables in shell scripting, focusing on $#, $?, $$, and $!. It explains how $# shows the number of arguments, $? provides the exit status of the last command, $$ gives the process ID of the current shell, and $! returns the process ID of the last background process. The tutorial includes examples and explanations to illustrate these concepts.

What does the dollar sign hash ($#) represent in shell scripting?

• The exit status of the last command

• The process ID of the current shell

• The total number of arguments passed to a script

• The process ID of the last background process

What does a zero exit status indicate when using the dollar sign question mark ($?)?

• The command was not found

• The command failed

• The command was successful

• The command is still running

If a command returns an exit status of 127, what does it mean?

• The command was successful

• The command was not found

• The command is still running

• The command failed due to a syntax error

What does the dollar dollar sign ($$) provide in a shell script?

• The process ID of the current shell

• The process ID of the last background process

• The total number of arguments passed to a script

• The exit status of the last command

Why does the process ID change each time a script is run?

• Because the script is executed in a subshell

• Because the script is executed in a different directory

• Because the script is executed in the main shell

• Because the script is executed in a virtual environment

What does the dollar sign exclamation mark ($!) provide?

• The process ID of the last background process

• The total number of arguments passed to a script

• The exit status of the last command

• The process ID of the current shell

In the context of shell scripting, what is the purpose of running a script with an ampersand (&) at the end?

• To run the script in the foreground

• To run the script in a different shell

• To run the script in the background

• To run the script with elevated privileges