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=head2 readline_cb($callback)

Reads a single line from STDOUT and calls C<$callback>

=head2 readline_cv([$condvar])

Reads a single line from STDOUT and send the result to C<$condvar>. A condition variable will be created and returned, if C<$condvar> is omitted.

=head2 readline_ch([$channel])

Reads a singe line from STDOUT and put the result to coro channel C<$channel>. A L<Coro::Channel> will be created and returned, if C<$channel> is omitted.

=head2 readlines_cb($callback)

Read lines continiously from STDOUT and calls on every line the handler C<$callback>.

=head2 readlines_ch([$channel])

Read lines continiously from STDOUT and put every line to coro channel C<$channel>. A L<Coro::Channel> will be created and returned, if C<$channel> is omitted.

=head2 readline()

Reads a single line from STDOUT synchronously and return the result.

Same as

	$proc->readline_cv->recv

=head2 readline_error_cb($callback)