My question is quite simple, if I am to enter these two line in OS X Terminal, what should happen?
xupengjunde-iMac:Shane Shane$ cd /Volumes/External xupengjunde-iMac:External Shane$ sudo chmod -RN *
The R flag on chmod means recursive, changing permission for every file/folder. The N flag means to remove ACL on files.
Now what about
*? Will that mean all files on /Volumes/External or all files on my Mac?