=over =item getc FILEHANDLE X<getc> X<getchar> X<character> X<file, read> =item getc Returns the next character from the input file attached to FILEHANDLE, or the undefined value at end of file or ...

=over =item rmdir FILENAME X<rmdir> X<rd> X<directory, remove> =item rmdir Deletes the directory specified by FILENAME if that directory is empty. If it succeeds it returns true; otherwise it retur...

=over =item cos EXPR X<cos> X<cosine> X<acos> X<arccosine> =item cos Returns the cosine of EXPR (expressed in radians). If EXPR is omitted, takes the cosine of L<C<$_>|perlvar/$_>. For the inverse ...

=over =item telldir DIRHANDLE X<telldir> Returns the current position of the L<C<readdir>|/readdir DIRHANDLE> routines on DIRHANDLE. Value may be given to L<C<seekdir>|/seekdir DIRHANDLE,POS> to ac...

=over =item sqrt EXPR X<sqrt> X<root> X<square root> =item sqrt Return the positive square root of EXPR. If EXPR is omitted, uses L<C<$_>|perlvar/$_>. Works only for non-negative operands unless yo...

=over =item vec EXPR,OFFSET,BITS X<vec> X<bit> X<bit vector> Treats the string in EXPR as a bit vector made up of elements of width BITS and returns the value of the element specified by OFFSET as ...

=over =item defined EXPR X<defined> X<undef> X<undefined> =item defined Returns a Boolean value telling whether EXPR has a value other than the undefined value L<C<undef>|/undef EXPR>. If EXPR is n...

=over =item tie VARIABLE,CLASSNAME,LIST X<tie> This function binds a variable to a package class that will provide the implementation for the variable. VARIABLE is the name of the variable to be en...

=over =item formline PICTURE,LIST X<formline> This is an internal function used by L<C<format>|/format>s, though you may call it, too. It formats (see L<perlform>) a list of values according to the...

=over =item pipe READHANDLE,WRITEHANDLE X<pipe> Opens a pair of connected pipes like the corresponding system call. Note that if you set up a loop of piped processes, deadlock can occur unless you ...