Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - CUSTOMIZATION User Manual download pdf (Page 264)

252 You Are Here

chmod a-x tigger

to remove execute access to all.

Here’s what happens now when we try to cd to into tigger:

[billy@localhost billy]$ cd tigger

bash: tigger: Permission denied

[billy@localhost billy]$

Let’s restore ours and our group’s access.

chmod ug+x tigger

Now, if we check our work with ls -dl we’ll see that only others will be denied access to tigger.

16.13 Fun with Numbers in chmod

Remember when we made a reference to the “shorthand” method of chmod? Here’sanotherwayto

change permissions; it may seem a little complex at ﬁrst - especially if math isn’t your strong suit.

Let’s go back to the original permissions for sneakers.txt.

-rw-rw-r-- 1 billy billy 150 Mar 19 08:08 sneakers.txt

Each permission setting can be represented by a numerical value:

r =4

w =2

x =1

- =0

When these values are added together, the total is used to set speciﬁc permissions - more speciﬁc

than changing permissions with the alphabetical “shorthand.”

In sneakers.txt, then, here are the numerical permissions settings:

- (-rw) (-rw) (r--)

|||

0+4+2 0+4+2 4+0+0

1 2 ... 259 260 261 262 263 264 265 266 267 268 269 ... 299 300

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Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - CUSTOMIZATION User Manual Page 264