Metacharacters: Most of the shell special characters are called as metacharacters. They are * / [ ] ‘ ” \ $ ; & ( ) | ^ < > new [ … ]

Wildcards are the shell features. It make the command line more powerful than GUI file managers. If we want to select a big group of files in a graphical file [ … ]

To get the input from the keyboard, the read command is used. It takes the input the input and assigns it to a variable.The read command is of two types [ … ]

An environment variable is a variable that is available to any child process of the shell. Some programs  need environment variables in order to function correctly. Usually a shell script [ … ]

Unset Variable: The shell built-in unset command is used for unsetting the data that an initialized variable is holding. Syntax: unset <Variable Name> Example: unset name The above example will [ … ]

The variables in bash are scalar. From Bash 2.0 it supports Array variables i.e., it can handle multiple values at the same time. All the naming rules of Shell variables [ … ]

In ksh and bash, the shell enable integer arithmetic to be to be performed.This avoids having to run an extra program such as expr or bc to do math in a shell script [ … ]

The Bourne shell can redirect a command’s standard output back to the shell’s own command line i.e., the command’s output can be used as an argument to another command, or [ … ]

There are certain limitations when the name of the variable is defined The name of the variable can contain letters(a to z and A to Z) It can have numbers [ … ]

A variable in shell script  is it is the means of referencing a numeric or character value. And unlike formal programming languages, a shell script does not require to declare [ … ]