Question

Which symbol is used for evaluation of variables?

(a) $

(b) &

(c) =

(d) @

The question was asked in an interview for job.

My question is taken from Command Substitution and Shell Variables topic in portion The Shell of Unix

Answer 1

Right choice is (a) $

The explanation: The shell supports variables that are useful both in the command line and shell scripts. These variables are called shell variables like TERM and SHELL.  A variable assignment is of the form variable=value(no spaces around =), but its evaluation requires the $ as a prefix to the variable name. For example,