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You can alter these permissions using the command <tt>chmod</tt> in conjunction with the octal notation discussed above, so for example | You can alter these permissions using the command <tt>chmod</tt> in conjunction with the octal notation discussed above, so for example | ||
{{Command|chmod 777 name_of_file}} | {{Command|chmod 777 name_of_file}} | ||
means that everyone on the machine now has the right to read, write and execute this file. Naturally you can only modify the permissions of a file or directory you own. You can also alter the | means that everyone on the machine now has the right to read, write and execute this file. Naturally you can only modify the permissions of a file or directory you own. You can also alter the group by means of the command <tt>chgrp</tt>. | ||
The file permissions discussed above have been available in Unix-like operating systems for decades now but they are very coarse-grained. The whole set of users is divided into just three categories: the owner, the group, and everyone else. What if I want to allow a single user who isn't in my group to read a file? Do I really need to make the file readable by everyone in that case? No. The Compute Canada's national systems offer "access control lists" (ACLs) to enable permissions to be set on a user-by-user basis if desired. The two commands needed to manipulate these extended permissions are | The file permissions discussed above have been available in Unix-like operating systems for decades now but they are very coarse-grained. The whole set of users is divided into just three categories: the owner, the group, and everyone else. What if I want to allow a single user who isn't in my group to read a file? Do I really need to make the file readable by everyone in that case? No. The Compute Canada's national systems offer "access control lists" (ACLs) to enable permissions to be set on a user-by-user basis if desired. The two commands needed to manipulate these extended permissions are | ||