To see what your current working directory is, use the command pwd:
stealth% pwd /stealth/users/ariel/Mail
To change to another directory as the current working directory, use the cd command.
Once you are in the directory where you want to create a subdirectory, use the command mkdir filename:
stealth% ls stealth% mkdir stuff stealth% ls stuff stealth% ls -l total 1 drwxr-xr-x 2 ariel 512 Jul 28 15:34 stuff
The ls before and afterwards shows that a new directory, with the name stuff, has been created, and the ls -l shows that it is indeed a directory.
You will need to use chmod to set the access permissions on the directory to something suitable.
You can use the mkdir command to make directories that do not get put in your current working directory, either by giving a full path to the directory:
stealth% pwd /stealth/users/ariel stealth% mkdir /stealth/users/ariel/Mail/morestuff stealth% ls -l /stealth/users/ariel/Mail/ total 2 drwxr-xr-x 2 ariel 512 Jul 28 15:39 morestuff drwxr-xr-x 2 ariel 512 Jul 28 15:34 stuff
or by giving a relative path with .. in the path when you want to go into a directory above your current one:
stealth% pwd /stealth/users/ariel/News stealth% mkdir ../Mail/evenmorestuff stealth% ls -l ../Mail/ total 3 drwxr-xr-x 2 ariel 512 Jul 28 15:41 evenmorestuff drwxr-xr-x 2 ariel 512 Jul 28 15:39 morestuff drwxr-xr-x 2 ariel 512 Jul 28 15:34 stuff
More information about the mkdir command is available by using the command man mkdir.