In Linux and UNIX the mkdir command creates directories.
Example
Here we create the folders test_folder and folder_1, folder_2 and see the result using ls.
admin@raspberrypi:~/temp $ mkdir test_folder
admin@raspberrypi:~/temp $ ls
test_folder
admin@raspberrypi:~/temp $ mkdir folder_1 folder_2
admin@raspberrypi:~/temp $ ls
folder_1 folder_2 test_folder
admin@raspberrypi:~/temp $
Usage
Usage: mkdir [OPTION]... DIRECTORY...
Create the DIRECTORY(ies), if they do not already exist.
Mandatory arguments to long options are mandatory for short options too.
-m, --mode=MODE set file mode (as in chmod), not a=rwx - umask
-p, --parents no error if existing, make parent directories as needed,
with their file modes unaffected by any -m option.
-v, --verbose print a message for each created directory
-Z set SELinux security context of each created directory
to the default type
--context[=CTX] like -Z, or if CTX is specified then set the SELinux
or SMACK security context to CTX
--help display this help and exit
--version output version information and exit
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Full documentation <https://www.gnu.org/software/coreutils/mkdir>
or available locally via: info '(coreutils) mkdir invocation