File Permission

gardenair · 04-27-2005, 08:47 PM

I want to change the user permissions i.e

$ touch myfile
$ls -l myfile

-rw-r--r--

$chmod u=+x myfile

here i also want to give the execute prmission to the user but
the list command shows (Read & Write also removed why ?)
$ls -l
----r--r--

yes the other way is to use the number(Octal) i.e
$chmod 700 myfile

$ls -l myfile

-rwx------

by using 744 with chmod it can show me desire desire result.
plz guide me that how can i adjuct it by using Owner,Group & Others

example chmod u=+r,+w,+x
so that i can view the the user have rwx permission.
Thanks in advance for the guidence.

michaelsanford · 04-27-2005, 09:18 PM

Code:

root@gateway:~# touch file
root@gateway:~# chmod a-rwx,u+rwx file
root@gateway:~# ls -la file
-rwx------  1 root root 0 2005-04-27 22:14 file*

Mixing + and = in a chmod directive seems to confuse the system, since:

Quote:

The operator `+' causes the permissions selected to be added to the existing permissions of each file; `-' causes them to be removed; and `=' causes them to be the only permissions that the file has.

gardenair · 04-28-2005, 03:53 AM

Thanks 'michaelsanford' for the guidence. In some books i saw that they use '+' or '-' sign to remove the permission . In your reply u did't use it & the system also does't give an error message . Still these are confusing me .
Any good site which u recommand me to study more about File permission.

Also what is the difference between ls -l & ls -aF

reddazz · 04-28-2005, 06:13 AM

"ls -l" lists the files in your directory excluding hidden ones. "ls -aF" lists all files ncluding hidden ones and then appends a character to each file to indicate what type of file it is.

bulliver · 04-28-2005, 03:28 PM

Quote:

Any good site which u recommand me to study more about File permission.

This one of course:
http://www.linuxquestions.org/questi...ticle&artid=20

michaelsanford · 04-28-2005, 10:35 PM

Sure I used + and - ... "a-rwx,u+rwx"

Also `man chmod` and `man chown` are good places to look.