Unix - Using Variables

_ALI
TOKEN_A
VAR_1
VAR_2

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2_VAR
-VARIABLE
VAR1-VAR2
VAR_A!

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Defining Variables:

variable_name=variable_value

						

NAME="Zara Ali"

						

VAR1="Zara Ali"
VAR2=100

						
Accessing Values:

#!/bin/sh

NAME="Zara Ali"
echo $NAME

						

Zara Ali

						
Read-only Variables:

#!/bin/sh

NAME="Zara Ali"
readonly NAME
NAME="Qadiri"

						

/bin/sh: NAME: This variable is read only.

						
Unsetting Variables:

unset variable_name

						

#!/bin/sh

NAME="Zara Ali"
unset NAME
echo $NAME