permissions


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting permissions
# 1  
Old 11-15-2010
permissions

My /tmp is set with the following permissions (777) and a 't' at the end.

My umask is set to 022.

When I create a directory under /tmp (tmp/xx) it gets created as 755
as expected.

Yet when I create a file within that directory (/tmp/xx/yy) the permissions
are not 755 they are 644.

Can somebody please explain. Secondly, how do I force the permissions
on a file to inherit the parent directories permissions regardless of what
my umask is set too.



Code:
 
umask
022

ls -ld /tmp
drwxrwxrwt   9 root     root        1464 Nov 15 09:14 /tmp
 
 ls -ld /tmp/xx
drwxr-xr-x   2 oracle   dba          117 Nov 15 09:17 /tmp/xx
 
ls -lt /tmp/xx/yyy
-rw-r--r--   1 oracle   dba            0 Nov 15 09:17 /tmp/xx/yyy

# 2  
Old 11-15-2010
umask dosn't set execute bit on files (ie file permissions start with 666 directories with 777)

so for files
Code:
666 AND NOT 022 = 644
 
In Binary:
110110110
111101101  AND
----------
110100100
rw-r--r--

And directories
Code:
777 AND NOT 022 = 755
 
In Binary:
111111111
111101101  AND
----------
111101101
rwxr-xr-x

There is no option to have umask set file permissions the same as their parent directory (and you wouldn't want to do that anyway as execute bit on directories controls searchability and has nothing to do with the execute bit on files within them).

You should only set execute bit on files that are actual commands (like script files or compiled programs).

If you want different permissions to these defaults, use the chmod command to change them after you've created your file.


The t on a directory is the sticky bit and means that only the file owner (or root) can remove files once they are created, even though the directory permissions allow write.

Last edited by Chubler_XL; 11-15-2010 at 01:51 PM..
This User Gave Thanks to Chubler_XL For This Post:
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Permissions

Hi guys, i write the below script to make the user get to the directory that interesting. Now what I am trying is to check the permissions of the directory and if the directory exists to check the reading options. echo "Please enter your desire folder directory ( \yourfolders) ?: \c" ... (9 Replies)
Discussion started by: mikerousse
9 Replies

2. UNIX for Dummies Questions & Answers

Permissions

Hi, I have noticed that on my Linux box there is a nice feature which make it impossible for specified member (owner, group or other) to have an given access if a member from which we would expect it more don't have that access. So it is impossible to read file by all if others have set read... (3 Replies)
Discussion started by: DavidMax
3 Replies

3. Shell Programming and Scripting

ksh; Change file permissions, update file, change permissions back?

Hi, I am creating a ksh script to search for a string of text inside files within a directory tree. Some of these file are going to be read/execute only. I know to use chmod to change the permissions of the file, but I want to preserve the original permissions after writing to the file. How can I... (3 Replies)
Discussion started by: right_coaster
3 Replies

4. HP-UX

To give the "unzip" permissions & "create" file permissions

Hi, I am a Unix Admin. I have to give the permissions to a user for creating new file in a directory in HP-Ux 11.11 system since he cannot able to create a new file in the directory. Thanks in advance. Mike (3 Replies)
Discussion started by: Mike1234
3 Replies

5. UNIX for Dummies Questions & Answers

permissions

to prohibit 'others' from deleting files, what should we omit: write or execute? thx (9 Replies)
Discussion started by: melanie_pfefer
9 Replies

6. HP-UX

Permissions

Hey, We've got quite a strange problem on our hands here. We are running an HP 9000/800 B.11.00. I've just created a new group in /etc/group which i called, let's say newgroup . Then I added 4 users to the group, namely user1, user2, user3, user4 . The command grpchk shows no strange things... (4 Replies)
Discussion started by: chrizz
4 Replies

7. UNIX for Dummies Questions & Answers

permissions

I saved a perl code in xemacs. I used an xterminal to execute it but unix said that I don't have permission. I saved the files in my home directory. How do I change the permission. This is hat unix said: -ksh: ./names.pl: cannot execute (5 Replies)
Discussion started by: lnatz
5 Replies

8. UNIX for Dummies Questions & Answers

Permissions

Hi everyone, I'm looking for some information concerning Unix permissions. I am new to Unix and am doing research for a graduate class. Given the permissions below, can anyone give me five unique exploits that would be available to a hacker/cracker given this configuaration? -rw-rw-rw- 1... (1 Reply)
Discussion started by: skeeter
1 Replies

9. UNIX for Dummies Questions & Answers

help with permissions

Can anyone help explain the "s" in the below permissions example. I was reading about the "sticky bit" (t) but I am a little confused. On file "test" wolf% chmod 4777 test wolf% ls -l total 4 drwx------ 2 john staff 512 Mar 19 21:34 nsmail -rwsrwxrwx 1 john staff ... (2 Replies)
Discussion started by: finster
2 Replies

10. UNIX for Dummies Questions & Answers

permissions

with permission set to d-wx--x--x directoryname Why can't I do a long-listing on this directory? Is read access necessary? (1 Reply)
Discussion started by: mma_buc_98
1 Replies
Login or Register to Ask a Question