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chmod to stop cat from displaying the file?

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Top Forums Shell Programming and Scripting chmod to stop cat from displaying the file?
# 8  
Old 10-05-2010
Code:
chmod u+r,g=0,o=0 "Yourfile"

is very much a valid command and it sets rwx permission to the owner of the file(assuming its already with 777 permission) and --- to the group and others. I have used this command myself and works like a charm. I find this method easier than the numbers.. Smilie
# 9  
Old 10-05-2010
I get
Code:
$ touch somefile
$ chmod u+r,g=0,o=0 somefile
chmod: invalid mode: `u+r,g=0,o=0'
Try `chmod --help' for more information.

It might be working in your particular environment, but it is not universal. Does this work on your system:
Code:
chmod u+r,go= somefile

# 10  
Old 10-05-2010
Code:
$>touch somefile
$>chmod u+r,g=0,o=0 somefile
$>ls -lrt somefile
-rw-------    1 G G        0 Oct  5  2010 somefile

Also
Code:
chmod u+r,go= somefile

works fine and gives the same result as my command... Smilie

I am on RedHat
# 11  
Old 10-06-2010
Remember for super user, permission bits are not checked.

That is, if you have 000 permission for a file, a super can cat the file.
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