There are two arguments for chmod: the permissions and the file/directory name. The permission argument
for chmod is based on numbers.
1 stands for execute.
2 stands for write.
4 stands for read.
To set more than one permission on a file/directory, you just add up the permissions. For example, 7
means read, write, and execute permissions. Chmod takes the permissions as the first argument in the
order user, group, global. Thus, the command chmod 777 hello will change the permissions of the
file hello to read, write and execute by user, group, and everyone else.
Note: To change the permissions of a file/directory, you must be the owner of that
file/directory. However, root can change permissions on any file/directory.
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