-p : A flag which enables the command to create parent directories as necessary. If the directories exist, no error is specified. If we specify the -p option, the directories will be created, and no error will be reported.

What does P mean Linux?

-p is short for –parents – it creates the entire directory tree up to the given directory. E.g., suppose there are no directories in your current directory.

What does P mean in command line?

-p created both, hello and goodbye. This means that the command will create all the directories necessaries to fulfill your request, not returning any error in case that directory exists.