RadShell is a command line shell for the PS2.
For the keyboard to work it loads the usbd.irx and the ps2kbd.irx. All other irxs are optional. On startup it runs the script radshell.rsh found in the same directory as the elf file. To make it easier to find irxs I have built-in the iomanx.irx and the filexio.irx. These are optional to load however. See radshell.rsh for an example. To get the harddrive to work refer to the hdd.rsh script.