RE:chmod

[Andrew Agno <agno@AI.SRI.COM>]

 > So, the primary question is, is there an easy way to set the permission on
 > directories, only directories, and all sub-directories?  A related question
 > is how to use ls to list only directories.

Use find; eg:

% find /starting/from/here -type d -print

This prints all directories and subdirectories of /starting/from/here,
including /starting/from/here.

To actually do something, write a little script and/or use the exec
flag:

% cat > something
#!/bin/bash
chmod 755 $1
<CTRL>-d
% chmod 755 something
% find /start/here/now -type d -exec ./something {} \;
equivalently:
% find /start/here/now -type d -exec chmod 755 {} \;

See the man page for find for details.

 > And if anyone's in a 'splaining mood, here's another one: how do
 > you set all files so that the group permissions match the user
 > permissions?  (If you have three files who's permissions are, for
 > example, 700, 600, 500, and you want them to be 770, 660, 550
 > respectively.)

Look at the info page for chmod:
% info chmod

You actually want to go to File permissions->Symbolic Models->Copying
Permissions, which has the following:

  Copying Existing Permissions
  ----------------------------
  
	 You can base a file's permissions on its existing permissions.  To
  do this, instead of using `r', `w', or `x' after the operator, you use
  the letter `u', `g', or `o'.  For example, the mode
	   o+g
  
  adds the permissions for users who are in a file's group to the
  permissions that other users have for the file.  Thus, if the file
  started out as mode 664 (`rw-rw-r--'), the above mode would change it
  to mode 666 (`rw-rw-rw-').  If the file had started out as mode 741
  (`rwxr----x'), the above mode would change it to mode 745
  (`rwxr--r-x').  The `-' and `=' operations work analogously.

Although I should note that this doesn't work for me when setting
other permissions, just group permissions--I can't get it to set write 
permissions for other.  Fortunately, it seems to work for what you
want to do.

Andrew.


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