Changes the owner (and group) of a list of files. The first two
elements of the list must be the NUMERICAL uid and gid, in that order.
Returns the number of files successfully changed.
<![CDATA[
$cnt = chown $uid, $gid, 'foo', 'bar';
chown $uid, $gid, @filenames;
]]>
Here's an example that looks up non-numeric uids in the passwd file:
<![CDATA[
print "User: ";
chop($user = <STDIN>);
print "Files: "
chop($pattern = <STDIN>);
($login,$pass,$uid,$gid) = getpwnam($user)
or die "$user not in passwd file";
@ary = <${pattern}>; # expand filenames
chown $uid, $gid, @ary;
]]>