Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - CUSTOMIZATION Uživatelský manuál stáhnout pdf (Strana 262)

250 You Are Here

w – write access

x – execute access

Actions

+ – adds the permission

- – removes the permission

= – makes it the only permission

Want to test it out? Let’s remove all permission from sneakers.txt – for everyone.

chmod a-rw sneakers.txt

Now, let’s see if we can read the ﬁle:

[billy@localhost billy]$ cat sneakers.txt

cat: sneakers.txt: Permission denied

[billy@localhost billy]$

Guess it worked; even we can’t get into the ﬁle. But since the ﬁle belongs to us, we can always change

permission to allow us read and write access. (See Figure 16.19)

[billy@localhost billy]$ chmod u+rw sneakers.txt

[billy@localhost billy]$ cat sneakers.txt

buy some sneakers

then go to the coffee shop

then buy some coffee

bring the coffee home

take off shoes

put on sneakers

make some coffee

relax!

[billy@localhost billy]$

Here are some common examples of settings that can be used with chmod:

g+w – adds write access for the group

o-rwx – removes all permissions for others

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Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - CUSTOMIZATION Uživatelský manuál Strana 262