Perl string concatenation: How to concatenate strings with Perl
Briefly

One of the best and simplest ways to concatenate Perl strings is with this syntax: $name = 'foo'; $filename = "/tmp/${name}.tmp";
Another way to concatenate Perl strings is to use the "dot" operator (i.e., the decimal character). In some circumstances it can make your Perl script easier to read than the syntax shown above.
Read at Alvinalexander
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