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You can also grant read, write, and execute permissions to members of the group users by changing the middle number from 0 to 7:
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Again, the changes are reflected in the symbolic permissions string displayed by ls:
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If you want to grant read, write, and execute permissions to all users, simply change the third permissions number from 0 to 7:
$ chmod 777 *
10:
File System Access Control
Now, all users on the system have read, write, and execute permissions on all files in the directory:
$ ls -l total 4 drwxrwxrwx -rwxrwxrwx
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Of course, the codes that can be used to specify permissions are usually not just 0 or 7. For example, the code 5 gives read and execute access, but not write access. So, if you wanted to grant read and execute access to members of the group, but deny write access, you could use the code 750:
$ chmod 750 *
This produces the following result:
$ ls -l total 4 drwxr-x---rwxr-x---
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If you wanted to remove all access permissions from the files in the current directory, you could use the code 000 (you should not normally need to do this):
$ chmod 000 *
Let s examine the result of the command:
$ ls -l total 4 d------------------
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All access permissions have been removed, except for the directory indicator on the special file test. Note the main difference between setting files using symbolic codes rather than octal codes: symbolic codes are relative; numeric codes are absolute. This means that unless you explicitly revoke a file permission when setting another using symbolic codes, it will persist. Thus, if a file already has group write access, and you grant group execute access (or remove group execute access), the write access permission is not removed. However, if you specify only group execute access using an octal code, the group write access is automatically removed if it has been previously set (i.e., when using the symbolic
Part III:
Security
codes, the administrator has more granularity in assigning permissions). You may well find that in startup scripts and situations where the permissions are unknown in advance, using octal codes is wiser.
Setting Default Permissions (umask)
You can enforce system-wide permissions by using a default user mask (umask), which sets the read, write, and execute permissions on all new files created by a specific user. If a user wants to use a umask other than the default system-wide setting, he or she can achieve this by setting it on the command line when required, or in the user s shell startup file (e.g., .kshrc for Korn shell), or in the global system default file, /etc/default/ login. In addition, the mask that is set for the current user can be displayed by using the umask command by itself. Like file permissions, the umask is set using octal codes. There are two different strategies for computing umasks. For directories, you must subtract the octal value of the default permission you want to set from octal 777; for files, you often subtract the octal value of the default permission you want to set from octal 666. For example, to set the default permission to 444 (all read only), you would subtract 444 from 666 for files, to derive the umask of 222. For the default permission 600 (user read/write, no other access), you would subtract 600 from 666, leaving a umask of 066 (which often is displayed as 66). The two mask modes are 2 for read and 4 for write. If you want all users to have full access permissions on all files that you create, except executable permissions, you would set the umask to 000 (666 000 = 666):
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