I wonder how "/^" could match anything
in the command you've given.
Anyway, df /foo/bar lists the data only for the
filesystem that contains the file /foo/bar
(which can be the root file system, or a fs mounted on /foo
or on /foo/bar).
The pure perl solution is to use ustat or statfs:
sub __NR_statfs () { 99 }; $file = "/"; $s = pack "x256"; -1 == syscal
+l(__NR_statfs, "".$file, $s) and die "error statfs: $!"; (undef, $bsi
+ze, undef, $bfree, $bavail) = unpack "l!5", $s; print $bavail*$bsize/
+1024, " kilobytes available\n";
Update: statfs is linux-specific
(Update: except not really,
but the structure might be different, I don't know).
Ustat might be usable on other systems too.
Update 2006 sep: note that system call numbers are different on every architecture (OS and CPU type). You have to look up the syscall number of your architecture.
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