unzip时的奇怪现象

pepe

本人在使用unzip命令时发现如下的奇怪现象，不知道是我的命令使用有问题还是unzip的bug？请各位高手指点：
1、从压缩包中解压指定类型（*.properties）的文件，WEB-INF/classes下不存在*.properties文件，命令执行结果按预期想法将所有*.properties解压
[deploy@Test1 dnmc]$ unzip -o ~/ulibbak/dnmc_primrose_bak_unionlib-dnmc-20070628-145.zip.zip WEB-INF/classes/*.properties -d .
Archive:  /opt/deploy/ulibbak/dnmc_primrose_bak_unionlib-dnmc-20070628-145.zip.zip
  inflating: ./WEB-INF/classes/booking.properties  
  inflating: ./WEB-INF/classes/com/cromoteca/meshcms/Locales.properties  
extracting: ./WEB-INF/classes/com/cromoteca/meshcms/Locales_en.properties  
  inflating: ./WEB-INF/classes/com/cromoteca/meshcms/Locales_es.properties  
  inflating: ./WEB-INF/classes/com/cromoteca/meshcms/Locales_fr.properties  
  inflating: ./WEB-INF/classes/com/cromoteca/meshcms/Locales_it.properties  
  inflating: ./WEB-INF/classes/com/cromoteca/meshcms/Locales_nl.properties  
  inflating: ./WEB-INF/classes/com/cromoteca/meshcms/Locales_zh.properties  
  inflating: ./WEB-INF/classes/com/k_int/gen/log4j.properties  
  inflating: ./WEB-INF/classes/config.properties  
  inflating: ./WEB-INF/classes/Connection.properties  
  inflating: ./WEB-INF/classes/Locales_en.properties  
  inflating: ./WEB-INF/classes/Log4j.properties  
  inflating: ./WEB-INF/classes/Connection.dnmc.properties  
  inflating: ./WEB-INF/classes/Connection.report.properties  
2、但当WEB-INF/classes下存在properties文件时，结果就出乎意料了，命令执行后只覆盖了已有的文件，原来不存在的没有解压缩出来，如下命令过程！
[deploy@Test1 dnmc]$ rm WEB-INF/classes/Connection.*
[deploy@Test1 dnmc]$ ls WEB-INF/classes/
booking.properties  com  config.properties  Locales_en.properties  Log4j.properties  nl  org  test  uk
[deploy@Test1 dnmc]$ unzip -o ~/ulibbak/dnmc_primrose_bak_unionlib-dnmc-20070628-145.zip.zip WEB-INF/classes/*.properties -d .
Archive:  /opt/deploy/ulibbak/dnmc_primrose_bak_unionlib-dnmc-20070628-145.zip.zip
  inflating: ./WEB-INF/classes/booking.properties  
  inflating: ./WEB-INF/classes/config.properties  
  inflating: ./WEB-INF/classes/Locales_en.properties  
  inflating: ./WEB-INF/classes/Log4j.properties  
[deploy@Test1 dnmc]$ unzip -o ~/ulibbak/dnmc_primrose_bak_unionlib-dnmc-20070628-145.zip.zip WEB-INF/classes/*properties -d .
Archive:  /opt/deploy/ulibbak/dnmc_primrose_bak_unionlib-dnmc-20070628-145.zip.zip
  inflating: ./WEB-INF/classes/booking.properties  
  inflating: ./WEB-INF/classes/config.properties  
  inflating: ./WEB-INF/classes/Locales_en.properties  
  inflating: ./WEB-INF/classes/Log4j.properties  
[deploy@Test1 dnmc]$ ls WEB-INF/classes/
booking.properties  com  config.properties  Locales_en.properties  Log4j.properties  nl  org  test  uk

pepe

本人使用的unzip的版本
unzip --version
caution:  both -n and -o specified; ignoring -o
UnZip 5.50 of 17 February 2002, by Info-ZIP.  Maintained by C. Spieler.  Send
bug reports to the authors at Zip-Bugs@lists.wku.edu; see README for details.