join

join EXPR,LIST

Joins the separate strings of LIST into a single string with fields separated by the value of EXPR, and returns that new string. Example:

$rec = join(':', $login,$passwd,$uid,$gid,$gcos,$home,$shell);

Beware that unlike split, join doesn't take a pattern as its first argument. Compare split.

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https://perldoc.perl.org/5.22.0/functions/join.html