Rules for Naming Variable Name (Both UDV and System Variable)

(1) Variable name must begin with Alphanumeric character or underscore character (_), followed by
one or more Alphanumeric character. For e.g. Valid shell variable are as follows
HOME
SYSTEM_VERSION
vech
no

(2) Don’t put spaces on either side of the equal sign when assigning value to variable. For e.g.. In
following variable declaration there will be no error
$ no=10
But here there will be problem for following
$ no =10
$ no= 10
$ no = 10

(3) Variables are case-sensitive, just like filename in Linux. For e.g.
$ no=10
$ No=11
$ NO=20
$ nO=2
Above all are different variable name, so to print value 20 we have to use $ echo $NO and Not any
of the following
$ echo $no # will print 10 but not 20
$ echo $No # will print 11 but not 20
$ echo $nO # will print 2 but not 20

(4) You can define NULL variable as follows (NULL variable is variable which has no value at the time
of definition) For e.g.
$ vech=
$ vech=”"
Try to print it’s value $ echo $vech , Here nothing will be shown because variable has no value i.e.
NULL variable.

(5) Do not use ?,* etc, to name your variable names.