????12 ???????
????cp  tiger.c   ../work(??tiger.c ?????????μ?work?????)
????cp  tiger     ./work  -r??????tiger?????????μ?work??)
????13.??????????????
????find -name filename       ???????filename?????????
????eg ??find -name tiger.c  ??????????tiger.c
????Tiger-John?????
????1>????????????? -r??-r ????????????
????2>????????????./????????????../
????13.mv ????????÷?????
????mv  tiger.c  ../work  (??tiger.c ?????????μ?work?????)
????mv  tiger.c  ./work   -r  (????tiger?????????μ?work??)
????14.??su ?л???root ????
????15.cd /???????
????16.cd ~????????
????Tiger-John???:
??????Щshell ????????????????ls ?????к????????????????????????????????
?????????????????????ü????????????????????man shell???????????????к????????÷???
???????????????????? man ls ???????ls ?????????ú????????÷?
?????????man ????????