Some simple newbie questions

olbaid · 04-12-2006, 11:34 PM

How do you doing the following?

- Change the server so that the default permissions on all newly created files are -rw- rw- r--/
- Change permissions on all files currently in the /tmp directory to 751
- Put back the passwords from the /etc/shadow file back in the /etc/passwd file

Thanks in advance...

pixellany · 04-13-2006, 12:20 AM

Homework, by any chance??

What server are you referring to? Is it one that you have administrator access to?

"Put back the passwords"---Why were they moved? In /etc/shadow, are they not encrypted?

Change permissions is done with chmod. "man chmod" for the details of the syntax.

Simon Bridge · 04-13-2006, 12:24 AM

You havn't told us which distro this is...
In general

- change server for file permissions ...
For me, I am using nautilus in FC4, and it has always done this. New files are always -rw-rw-r-- unless they are directories, in which case they are drwxrwxr-x because you need execution permission to view the directory contents.

So: what do you mean by "server"?

- change permissions of all files in temp dire to 751

chmod 751 /temp/*

for eg... on a spare directory of files I have:

Code:

# ls -l
total 640
-rw-r--r--  1 simon simon   2748 Jun 24  2005 general11.gif
-rw-r--r--  1 simon simon   2885 Jun 24  2005 general12.gif
-rw-r--r--  1 simon simon   7434 May 14  2005 kowhai_gold.jpg
[extra listings deleted]
# chmod 751 *
# ls -l
total 640
-rwxr-x--x  1 simon simon   2748 Jun 24  2005 general11.gif
-rwxr-x--x  1 simon simon   2885 Jun 24  2005 general12.gif
-rwxr-x--x  1 simon simon   7434 May 14  2005 kowhai_gold.jpg
[extra listings deleted]
#

man chmod for more detail. (Though, why you would want "others" to be able to execute files they cannot see, escapes me.)

- put passwords back into /etc/passwd
Why on earth would you want to do that?
http://geodsoft.com/howto/password/

raskin · 04-13-2006, 12:36 AM

1. I guess umask 0111 (in the login script of every user)
2. chmod -R 0751 /tmp

Simon Bridge · 04-13-2006, 12:47 AM

umask 0113 for -rw-rw-r-- surely?

raskin · 04-13-2006, 12:50 AM

Oops, it's my typo..

olbaid · 04-13-2006, 01:19 AM

Sorry the distro is SuSE 9.0

timmeke · 04-13-2006, 01:51 AM

The umask can go in /etc/bashrc (for all bash shells) or /etc/profile (for all logins).

As for the chmod, the OP asked to change only the permissions on files, not subdirectories of /tmp.
So I suppose he'll be needing a script like this:

Code:

for i in `ls /tmp`; do
  if ( -f /tmp/$i ); then
    chmod 751 /tmp/$i;
  fi;
done;

or use a find command like:

Code:

find /tmp -type f -maxdepth 1 -exec chmod 751 {} \;

As for moving the passwords from shadow to passwd file, I agree with Simon_Bridge. They were put (encrypted) in the shadow file for a security reason. So, keep them in there.

Simon Bridge · 04-13-2006, 02:41 AM

olbaid: please put your distro in your profile. Thank you.