????7. ???????
????iconv -f gbk -t utf-8 -c  text.txt -o text.out #-f:from -t:to -c??????к?????Ч????? -o??????????
????8. ???????
????chmod ???? ?????   #???????????r:1 w:2 x:4
????chown ????? ?????
????chgrp ???? ?????
????9. ??? |  ????? >
????ls   -l   |grep   "^-"   |   wc   -l  #grep ?????????'-'?????? wc -l:????????????????????
????ls   -l   |grep   "^-"  >file_name1   #???????????λ??file_name1?????????????λ
????ls   -l   |grep   "^-"  >>file_name2  #???????????????file_name2????棬????????????????????????洢
????10. ???????????
????curl http://www.cnblogs.com/kaituorensheng/                                                    #?????????????????HTML???; -l????????? -i ??????
????curl http://e.hiphotos.baidu.com/image/pic/item/50da81cb39dbb6fd1e165c260a24ab18972b3764.jpg   #??????
????curl "www.hotmail.com/when/junk.cgi?birthyear=1905&press=OK"                                   #????????????birthyear=1905??press=OK"