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IO::Unread for Linux

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company name:
Ben Morrow
license: Freeware
minimum requirements: · Perl
functional limitations:
IO::Unread for Linux description
IO::Unread is a Perl module that exports one function, unread, which will push data back onto a filehandle. Any amount of data can be pushed: if your perl is built with PerlIO layers, the data is stored in a special :pending layer; if not, the module ties the filehandle to a class which returns the unread data and unties itself.

unread FILEHANDLE, LIST

unread unreads LIST onto FILEHANDLE. If LIST is omitted, $_ is unread. Returns the number of characters unread on success, undef on failure. Warnings are produced under category io.

Note that unread $FH, 'a', 'b' is equivalent to

unread $FH, 'a';
unread $FH, 'b';

, ie. to unread $FH, 'ba' rather than unread $FH, 'ab'.

ungetc FILEHANDLE, STRING

ungetc pushes the first character of STRING onto FILEHANDLE. Unlike unread, it does not use a tie implementation if your perl doesn't support PerlIO layers; rather it calls your ungetc(3). This is only guarenteed to support one character of pushback, and then only if it is the last character that was read from the handle.

SYNOPSIS

use IO::Unread;

unread STDIN, "hello world
";

$_ = "goodbye";. The CPAN Search Site - search.cpan.org.
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