- publishing free software manuals
Perl Language Reference Manual
by Larry Wall and others
Paperback (6"x9"), 724 pages
ISBN 9781906966027
RRP £29.95 ($39.95)

Sales of this book support The Perl Foundation! Get a printed copy>>>

Unknown PerlIO layer "%s"

(W layer) An attempt was made to push an unknown layer onto the Perl I/O system. (Layers take care of transforming data between external and internal representations.) Note that some layers, such as mmap, are not supported in all environments. If your program didn't explicitly request the failing operation, it may be the result of the value of the environment variable PERLIO.

ISBN 9781906966027Perl Language Reference ManualSee the print edition