port core utilities

[42-cjeon]

• [x] touch
• [x] dash
• [x] cat
• [x] chmod
• [x] cp
• [x] date
• [x] dd
• [x] df
• [x] echo
• [x] hostname
• [x] kill
• [x] ln
• [x] ls
• [x] mkdir
• [x] mv
• [x] ps
• [x] pwd
• [x] rm
• [x] rmdir
• [x] sleep