chmod and chown recursion (sudo)

[Nils Kassube]

Thufir Hawat wrote:
> From what I see, the download has odd permissions and ownership which
> I've not yet fixed.

> thufir at tleilax:~/Downloads$ wget
> http://apress.com/resource/bookfile/4045 --2011-03-15 09:53:22-- 

> thufir at tleilax:~/Downloads$ ll
> total 24
> drwxr-xr-x  2 thufir thufir  4096 2011-03-15 09:53 ./
> drwxr-xr-x 80 thufir thufir  4096 2011-03-15 08:56 ../
> -rw-r--r--  1 thufir thufir 14451 2011-03-15 09:53 4045
> thufir at tleilax:~/Downloads$
> thufir at tleilax:~/Downloads$ tar -xf 4045

Why "tar -xf 4045"? If I use "file 4045" to determine the file type, it 
tells me it is gziped. And if I unzip it, it is a tar file. Therefore it 
should be "tar xzf 4045" instead.

> thufir at tleilax:~/Downloads$ ll
> total 28
> drwxr-xr-x  3 thufir thufir  4096 2011-03-15 09:53 ./
> drwxr-xr-x 80 thufir thufir  4096 2011-03-15 08:56 ../
> -rw-r--r--  1 thufir thufir 14451 2011-03-15 09:53 4045
> d---------  5 thufir thufir  4096 2008-06-22 06:15
> FaceletsEssentials/ thufir at tleilax:~/Downloads$
> thufir at tleilax:~/Downloads$
> thufir at tleilax:~/Downloads$ ll FaceletsEssentials/
> ls: cannot open directory FaceletsEssentials/: Permission denied

Without rx permissions you can't list the directory contents, therefore 
I would expect that result.

> thufir at tleilax:~/Downloads$ sudo chmod -R ugo+rw  FaceletsEssentials

Why sudo? It is your directory and therefore sudo isn't needed. Granted, 
it will ignore the missing x flags for the directories, but a

chmod -R 700 FaceletsEssentials/

should fix it without sudo. Of course it is useful to remove the x flag 
for the ordinary files afterwards with something like

find FaceletsEssentials/ -type f -exec chmod 600 {} \;

And if you really want to grant "group" and "others" read permissions, 
the numbers would be 755 for directories and 644 for ordinary files.


Nils