A command script is simply a file, which contains a set of normal linux commands that the command shell will perform automatically in the given order. … Compared to real programming languages, like python, perl or c, programming with linux (bash, tcsh, csh or sh) is computationally rather ineffective.

What is scripting in Unix?

When you login to a Unix system, a program called a shell process is run for you. A shell process is a command interpreter that provides you with an interface to the operating system. A shell script is just a file of commands, normally executed by a shell process that was spawned to run the script.

What is $? In Linux shell script?

$? is a special variable in shell that reads the exit status of the last command executed. After a function returns, $? gives the exit status of the last command executed in the function.