Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - CUSTOMIZATION Manuel d'utilisateur télécharger pdf (Page 265)

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16.13 Fun with Numbers in chmod 253

The total for the user is six, the total for the group is six and the total for others is four. The permis-

sions setting, then, is read as 664.

If we want to change sneakers.txt so those in our group didn’t have write access, but could still

read the ﬁle (as shown in Figure 16.20), we’ll have to remove the access by subtracting 2 from that set

of numbers.

The numerical values, then, would become six, four and four – or 644.

So we can type:

chmod 644 sneakers.txt

Let’s check our changes by listing the ﬁle (ls -l sneakers.txt):

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

Figure 16.20: Removing group write permissions

And there it is; now, neither the group nor others have write permission to sneakers.txt.To

return the group’s write access for the ﬁle, we can just add the value of w (2) to the second set of

permissions.

1 2 ... 260 261 262 263 264 265 266 267 268 269 270 ... 299 300

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Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - CUSTOMIZATION Manuel d'utilisateur Page 265

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