Red Hat NETSCAPE MANAGEMENT SYSTEM 6.1 - COMMAND-LINE Guida di Installazione Scaricare il pdf (Pagina 119)

Chapter 11. Shell Prompt Basics 119

Figure 11-10. Changing Permissions for sneakers.txt

To remove read and write permissions from sneakers.txt use the chmod command to take away

both the read and write permissions.

chmod go-rw sneakers.txt

By typing go-rw, you are telling the system to remove read and write permissions for the group and

for others from the ﬁle sneakers.txt.

The result will look like this:

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

Think of these settings as a kind of shorthand when you want to change permissions with chmod,

because all you really have to do is remember a few symbols and letters with the chmod command.

Here is a list of what the shorthand represents:

Identities

u — the user who owns the ﬁle (that is, the owner)

g — the group to which the user belongs

o — others (not the owner or the owner’s group)

a — everyone or all (u, g, and o)

Permissions

r — read access

w — write access

x — execute access

Actions

+ — adds the permission

- — removes the permission

= — makes it the only permission

Want to test your permissions skills? Remove all permissions from sneakers.txt — for everyone.

chmod a-rwx sneakers.txt

Now, see if you can read the ﬁle:

1 2 ... 114 115 116 117 118 119 120 121 122 123 124 ... 157 158

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Red Hat NETSCAPE MANAGEMENT SYSTEM 6.1 - COMMAND-LINE Guida di Installazione Pagina 119