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Linux: Difference between revisions
→Permissions
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==Permissions== | ==Permissions== | ||
In unix filesystems, files and folders have individual permissions.<br> | |||
You can set permissions for each file/folder independently and for the following sets of users: | |||
* User/Owner <code>u</code> | |||
* Group <code>g</code> | |||
* Other <code>o</code> | |||
You can also set permissions for all of the above with: | |||
* All <code>a</code> | |||
Each file and folder can have the following permission for each set of user: | |||
* Read <code>r</code> | |||
* Write <code>w</code> | |||
* Execute <code>x</code> | |||
The above totals 9 bits (3 sets of users times 3 permissions). | |||
In addition to the above, there are 3 special bits: | |||
* Sticky bit <code>t</code> - only allow the owners of subfiles/subfolders to modify them | |||
** Useful for shared folders such as /tmp | |||
* Setuid - automatically elevate execution of this file to the owner's priviledges | |||
* Setgid - automatically elevate execution of this file to the group's priviledges | |||
In total, permissions for each file and folder can be stored in 16 bits or 2 bytes. | |||
===chmod=== | |||
===chown=== | |||
===chgrp=== | |||
==OpenVPN== | ==OpenVPN== | ||
See [https://help.ubuntu.com/lts/serverguide/openvpn.html https://help.ubuntu.com/lts/serverguide/openvpn.html]<br> | See [https://help.ubuntu.com/lts/serverguide/openvpn.html https://help.ubuntu.com/lts/serverguide/openvpn.html]<br> | ||