Programming Perl, 4th Edition

join

join EXPR, LIST

This function joins the separate strings of LIST into a single string with fields separated by the value of EXPR, and returns the string. For example:

$rec = join ":", $login,$passwd,$uid,$gid,$gcos,$home,$shell;

To do the opposite, see split. To join things together into fixed-position fields, see pack. The most efficient way to concatenate many strings together is to join them with a null string:

$string = join "", @array;

Unlike split, join doesn’t take a pattern as its first argument and will produce a warning if you try.