ЭЛЕКТРОННАЯ БИБЛИОТЕКА КОАПП
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3.2.78 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:

$_ = 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.