Linux OS Shell Question: Download Linux Shell PDF

Which one of the following statement is true about variables in shell?
a) variables do not require declaration before assigning value to them
b) variables are case sensitive
c) to extract the contents of a variable, we have to provide the variable a preceding $
d) all of the mentioned

d) all of the mentioned

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Which command reads user input from the terminal and assign this value to a variable name? a) read b) get c) declare d) set	Which one of the following is not a valid shell variable? a) _san b) san_2 c) _san_2 d) 2_san