Perl 5 version 8.9 documentation
In list context, returns a (possibly empty) list of filename expansions on the value of EXPR such as the standard Unix shell /bin/csh would do. In scalar context, glob iterates through such filename expansions, returning undef when the list is exhausted. This is the internal function implementing the
<*.c>operator, but you can use it directly. If EXPR is omitted,
$_is used. The
<*.c>operator is discussed in more detail in I/O Operators in perlop.
globwill split its arguments on whitespace, treating each segment as separate pattern. As such,
glob('*.c *.h')would match all files with a .c or .h extension. The expression
glob('.* *')would match all files in the current working directory.
Beginning with v5.6.0, this operator is implemented using the standard
File::Globextension. See File::Glob for details, including
bsd_globwhich does not treat whitespace as a pattern separator.