Show All Files under Mac

Show all hidden files:

First command: Defaults write Com.apple.finder appleshowallfiles TRUE
Enter, forcing the system to change the preferences folder in the user repository com.apple.finder.plist file appleshowallfiles parameter value to True
Second command: Killall Finder interrupts the finder process, refreshes the view

1 Write Com.apple.finder appleshowallfiles  TRUE2killall Finder

Do not show hidden files:

1 Write Com.apple.finder appleshowallfiles  FALSE2killall Finder

Show All Files under Mac