| Date: Tue, 29 Jan 2008 08:39:29 +0000
| From: Frank Murphy <frankly3d.ilug at gmail.com>
| root at fedora8 ~]# chmod a+rX -r /etc/xdg/menus
| chmod: cannot access `a+rX': No such file or directory
| /etc/xdg/menus does exist.
| Where am I going wrong
as others have noted, chmod(1) does not have a -r option.
whilst that's pedantically correct, it's not quite right.
normally, on an non-existent option like -r, you'd expect
an error something like:
chmod: invalid option -- r
Try `chmod --help' for more information.
so why the rather mysterious complaint that a+rX does not
well .... because -r *IS* a legal mode setting to chmod;
in particular, it means a-r (i.e., remove read permission
for everyone). because it starts with - the command line
is rearranged (probably by GNU getopt_long(3)) so that it
is the first arg:
chmod -r a+rX /etc/xdg/menus
the missing a is then supplied:
chmod a-r a+rX /etc/xdg/menus
now chmod attempts to remove read permission for everyone
from all the listed files, starting with the "file" a+rX.
there is no such file, hence the error ....
and it did remove all read permissions from /etc/xdg/menus
(in case you hadn't noticed).
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