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Perl in a Nutshell

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Function Reference
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join char, list

Joins the separate strings of list into a single string with fields separated by the value of char, 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.

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Reference: ioctlBook IndexReference: keys