The Shell is a command line user interface implemented for OZ 5.0. It provides an environment for binary execution with a fully access to all OZ services. The Shell is a good application, multiple instances can be suspend or revived at any time. Some commands are internal, integrated in the application : exit, cd, pwd, cls. The external commands are binaries. By default, basic commands have been implemented. They are stored in the internal file area (:EPR.0/bin/). Those commands manipulates :
- filesystem : ls, rm, cp, mv, mkdir, rmdir
- process : ps, kill, cli
- tools : mw, dz, crc32
help : man
Example screenshots :
The execution environment follows the ELF specification like in many modern Unix operating systems. A specific API has been developed to interface with ELF standard : GN_Elf. This general user interface call does all the magic to open, load, execute and close the ELF file. This is performed by using the ELF low-level interface DC_Elf and DC_Rte. GN_Elf allows arguments to be passed to the executable. They are passed via the stack, following the SDCC convention. Binary executables can be written in C language and compiled with the SDCC compiler suite (with a modified crt0.s loader). They are actually limited to 56K and will be unlimited in a near future.