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The next example would set both the sticky bit and the User ID permission on the newprogs directory. The permission 5755 has the binary equivalent of 101 111 101 101. # chmod 5755 /usr/bin/newprogs # ls -l /usr/bin/newprogs drwsr-xr-t 1 root root 4096 /usr/bin/newprogs
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The sticky bit permission symbol is t. The sticky bit shows up as a t in the execute position of the other permissions. A program with read and execute permission with the sticky bit would have its permissions displayed as r-t.
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# chmod +t /home/dylan/myreports # ls -l /home/dylan/myreports -rwxr-xr-t 1 root root 4096 /home/dylan/myreports
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Permission Defaults: umask
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Whenever you create a file, it is given default permissions. You can display the current defaults or change them with the umask command. The permissions are displayed in binary or symbolic format as described in the following sections. The default permissions include any execute permissions that would be applied to executable files like programs or scripts. Standard data files do not use the executable permissions. To display the current default permissions, use the umask command with no arguments. The -S option uses the symbolic format. $ umask -S u=rwx,g=rx,o=rx This default umask provides rw-r--r-- permission for standard files, and adds execute permission for executable files, rwxr-xr-x. You can set a new default by specifying permissions in either symbolic or binary format. To specify the new permissions, use the -S option. The following example
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denies others read permission, while allowing user and group read access, which results in permissions of rwxr-x---. $ umask -S u=rwx,g=rx,o=
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When you use the binary format, the mask is the inverse of the permissions you want to set. So, to set both the read and execute permission on and the write permission 2 off, you would use the octal number 2, a binary 010. To set all permissions on, you would use an octal 0, a binary 000. 2 The following example shows the mask for the permission defaults rwx, rx, and rx. $ umask 0022 To set the default to only deny read permission for others, you would use 0027, using the binary mask 0111 for the other permissions. $ umask 0027
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Disk Quotas
You can use disk quotas to control how much disk space a particular user makes use of on your system. On your Linux system, unused disk space is held as a common resource that each user can access as they need it. As a user creates more files, they take the space they need from the pool of available disk space. In this sense, all the users are sharing a single resource of unused disk space. However, if one user were to use up all the remaining disk space, none of the other users would be able to create files or even run programs. To counter this problem, you can create disk quotas on particular users, limiting the amount of available disk space they can use.
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Quota Tools
Quota checks can be implemented on the file system of a hard disk partition mounted on your system. The quotas
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are enabled using the quotacheck and quotaon programs. On Red Hat, they are executed in the /etc/rc.d/rc .sysinit script, which is run whenever you start up your system. Each partition needs to be mounted with the quota options, usrquota or grpquota. usrquota enables quota controls for users, and grpquota works for groups. These options are usually placed in the mount entry in the /etc/fstab file for a particular partition (see 5). For example, to mount the /dev/hda6 hard disk partition mounted to the /home directory with support for user and group quotas, you would require a mount entry like the following:
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