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/Perl 5.20

readlink

Returns the value of a symbolic link, if symbolic links are implemented. If not, raises an exception. If there is a system error, returns the undefined value and sets $! (errno). If EXPR is omitted, uses $_ .

Portability issues: readlink in perlport.

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http://perldoc.perl.org/5.20.2/functions/readlink.html