Imported from NetBSD:
	cat,pwd

Imported from FreeBSD:
	ed

Imported from OpenBSD:
	chflags,chgrp,chmod,chown,cp,date,dd,df,env,ln,ls,mv,nl,nohup,
	rm,rmdir,sleep,stty,test,time,touch

Imported from Sbase:
	grep

Imported from MirOS(MirBSD):
	mksh,lksh,pax

Clean implementation:
	domainname,echo,false,head,hostname,mkdir,sync,true

sed is GNU sed with a hitchhiker-ized build system
