The core utilities are Cmajor programs that can be run in the sxx virtual machine either by giving the name of the utility program as an argument to sxx virtual machine, or by starting the sxx without arguments so that it runs a shell, and then starting the program from the shell.
| cat | concatenates files and prints on standard output |
| chmod | changes access mode bits of one or more files |
| cp | copies files and directories |
| echo | prints arguments to standard output |
| head | prints first 10 lines of each file to standard output |
| hexdump | prints the contents of a file as hexadecimal |
| less | view paginated output |
| ls | lists the contents of a directory |
| mkdir | makes directories |
| mv | renames or moves files |
| passwd | changes or deletes the password of a user account |
| rm | removes files and directories |
| rmdir | removes a directory if it is empty |
| sudo | executes a command as superuser |
| tail | prints last 10 lines of each file to standard output |
| time | executes a command and prints timing statistics |
| whoami | prints the user ID and user name of the current user |