CMD命令 chmod 666/777/744 的含义

参考链接：http://superuser.com/questions/295591/what-is-the-meaning-of-chmod-666

Chmod change attributes from a file/folder
chmod 666 means that all users can read and write but cannot execute
chmod 777 allows all actions for all users

chmod 744 allows only owner to do all actions; group and other users are allowed only to read

permission to:  owner      group      other
/¯¯¯\      /¯¯¯\      /¯¯¯\
octal:            6          6          6
binary:         1 1 0      1 1 0      1 1 0
what to permit: r w x      r w x      r w x

binary         - 1: enabled, 0: disabled

what to permit - r: read, w: write, x: execute

permission to  - owner: the user that create the file/folder
group: the users from group that owner is member
other: all other users