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-Like most modern filesystems, those used on the servers of Compute Canada support the idea of permissions to read, write, and execute files and directories. When you attempt to read, modify or delete a file, or access a directory, e.g. with <tt>cd</tt>, the Linux kernel first verifies that you have the right to do this. If not, you'll see the error message "Permission denied". For each filesystem object (file or directory) there are three categories of users:
+Like most modern filesystems, those used on Compute Canada clusters support the idea of permissions to read, write, and execute files and directories. When you attempt to read, modify or delete a file, or access a directory, e.g. with <tt>cd</tt>, the Linux kernel first verifies that you have the right to do this. If not, you'll see the error message "Permission denied". For each filesystem object (file or directory) there are three categories of users:
 # the object's owner --- normally the user who created the object,
 # members of the object's group --- normally the same as the owner's default group, and