English to Persian (Farsi) Other Computers: Software

Command substitution is very commonly used in shell scripts, and you will see
it used throughout this chapter. Another commonly used metacharacter is $, used to
obtain the value of a variable, as in the command echo $PATH.
Why are ‘ and “ called strong quote and weak quote characters, respectively? In
short, because ‘ is stronger than “. That is, ‘ forces Bash to interpret all special
characters literally, while “ protects only some of Bash’s special characters from
interpretation as special characters.