HelenOS sources

root/uspace/app/bdsh/cmds/modules/

[..]
alias/ cat/ cmp/ cp/ echo/
help/ kcon/ ls/ mkdir/ mkfile/
module_aliases.c module_aliases.h modules.c modules.h mount/
mv/ printf/ pwd/ rm/ sleep/
touch/ unalias/ unmount/
[..]
HelenOS homepage, sources at GitHub