q/ string / qq/ string / qx/ string / qw/ strings /
Generalized forms of quoting.
q//
is equivalent to using single quotes (literal, no variable interpolation).
qq//
is equivalent to double quotes (literal, interpolated).
qx//
is equivalent to using backticks for commands (interpolated). And
qw//
is equivalent to splitting a single-quoted string on whitespace.
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