Linux OS Shell Interview Question:

Which one of the following is not a valid shell variable?
a) _san
b) san_2
c) _san_2
d) 2_san

Submitted by: Murtaza

d) 2_san
Explanation:
The shell variable can contain only letters(a to z or A to Z), numbers(0 to 9), or a underscore character(_) and a variable can not start with a number.
Submitted by: Murtaza