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

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If set to the name of a file or device then certain operations of PerlIO sub-system will be logged to that file (opened as append). Typical uses are Unix:

PERLIO_DEBUG=/dev/tty perl script ...

and Win32 approximate equivalent:

perl script ...

This functionality is disabled for setuid scripts and for scripts run with -T.

ISBN 9781906966027Perl Language Reference ManualSee the print edition