SYNOPSIS use Filesys::Cap qw(fs_has_attr_x fs_is_ci fs_is_cs fs_can_symlink); say "Filesystem has x attribute" if fs_has_attr_x(); say "Filesystem is case-insensitive" if fs_is_ci("/tmp"); say "Filesystem is case-sensitive" if fs_is_cs("/tmp"); say "Filesystem can do symlinks" if fs_can_symlink("/tmp"); FUNCTIONS fs_has_attr_x([ $dir ]) => bool Return true if filesystem has x attribute, meaning it can have files that pass -x Perl file test operator as well as files that fail it. This is done by actually creating two temporary files under $dir, one chmod-ed to 0644 and one to 0755 and test the two files. If $dir is not specified, will use a temporary directory created by tempdir(). Will return undef on failure (e.g.: permission denied, etc). fs_is_ci([ $dir ]) => bool Return true if filesystem is case-insensitive, meaning it is impossible to create two files with the same name but differing case (e.g. "foo" and "Foo"). This is done by actually creating two temporary files under $dir. If $dir is not specified, will use a temporary directory created by tempdir(). Will return undef on failure (e.g.: permission denied, etc). fs_is_cs([ $dir ]) => bool The opposite of fs_is_ci, will return true if filesystem is case-sensitive. fs_can_symlink([ $dir ]) => bool Return true if filesystem can do symlinks. This is tested by creating an actual temporary symlink. Note that this check is performed first: return undef unless eval { symlink("",""); 1 }; If $dir is not specified, will use a temporary directory created by tempdir(). Will return undef on failure (e.g.: permission denied, etc). SEE ALSO To list filesystems and their properties (so, the more proper/rigorous version), see Sys::Filesystem.