Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - CUSTOMIZATION User Manual download pdf (Page 260)

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Tip: Remember that ﬁle permissions are a security feature. Whenever you allow every-

onetoread,writetoandexecuteﬁles, you may be increasing your risk of tampering. As

a rule, then, you should shy away from allowing everyone to read and write to a ﬁle.

In this case, however, let’s say that we want to allow everyone to write to the ﬁle, so they can read it,

write notes in it and save it. That means we’ll have to change the change the “others” section of the

ﬁle permissions.

Since we’re the owner of the ﬁle, we don’thavetosu to root to do it. Let’s take a look at the ﬁle ﬁrst.

At the shell prompt, type:

ls -l sneakers.txt

which gives us this ﬁle information:

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

Now, type the following:

chmod o+w sneakers.txt

To check our results, we can list the ﬁle’s details again. Now, the ﬁle looks like this:

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

There’s our result: Now, everyone can read and write to the ﬁle (Figure 16.18).

When we typed o+w,weweresaying,“for others, add write permission to the ﬁle sneakers.txt.”

If we want to remove all access permission from sneakers.txt (eventhoughit’sonlyasketchy

shopping list), we could use the chmod command to take away both the read and write permissions

like so:

chmod go-rw sneakers.txt

and the result will look like this:

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

1 2 ... 255 256 257 258 259 260 261 262 263 264 265 ... 299 300

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Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - CUSTOMIZATION User Manual Page 260