If you have used perforce, you'd have definitely come across a situation where you wanted to sync files belonging to two different labels, but as soon as you sync the second label, the files from the first label get deleted. P4 help suggests the following ways to achieve this:
PLAIN TEXT
CODE:

p4 sync @label1,label2

or something like
PLAIN [...]

Perforce is an excellent revision control system for the code but the GUIs (P4WIN and P4V) are too slow to be productive. Hence, I like to do most of my work through command lines. Now, the other day I needed to add a directory and all its subdirectories and files to the repository (or perforce [...]