Unix and Linux

Shell is an environment in which we can run commands, programs and Shell scripts. There are different versions of Shell, which differ only from the version of the operating

A variable is a string of characters from which we assign a value. The assigned value can be a number, text, file name, device or any other type of data.

The previous tutorial has warned about using special characters in your variable name. This is because these characters are used in the names of special variables in Unix. These

A shell variable is able to hold a single value. This type of variables is called scalar variables.

There are many operators supported by each Shell. Our tutorial is based on the default Shell (Bourne) so we are discussing Bourne shell operators in this chapter.

This tutorial lists all the operators available in C Shell. Here, most operators are similar to those we have in the C Programming Language.

This tutorial lists all the operators available in the Korn Shell. Here most of these operators are similar to what we have in the C Program language.