?????????
????1.????????????????code????
????find . -name code -print
????./code
????2.?????в???????????5????????????????????
????find -atime +5 -exec rm {} ;
????3.??????????????????
????find / -type d |sort
????4.???????????????а???”.log”??β????
????find / -type d -name "*.log"
????5.???????н?5?????????
????find -atime -5
????6.???????н?5??????????
????find -amin -5
????7. ??????????????????755????????????ó?777
????find . -perm 755 -exec chmod 777 {} ;
????grep

?????????grep ??????в?????????????????????????
????grep [???]  [???]
????eg  : grep "test*"  ./test.txt
????whersis

????????????????г???????????????·??
????eg whereis ls
????which

??????????????????????????·??
????eg  ?? which  ls