删除文件时排除特定文件
删除当前目录下所有 *.log文件，除了nginx.log
rm `ls *.log|egrep -v nginx.log`
rm `ls *.log|awk '{if($0 != "nginx.log") print $0}'`
排除多个文件
rm `ls *.log|egrep -v '(nginx.log|mysqld.log|http.log)'`
rm `find . -name *.log | egrep -v '(nginx.log|mysqld.log|http.log)'`