字符串示例为：

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/Users/yfan/Downloads/dsc20170801_jar/releases/com/netfinworks/ufs/ufs-client/ufs-client-2.0.0.jar

需求：如果使用斜杠/作为分隔符的话，可能每个字符串的字段数不同，这时需要取 除了最后两个字段外的其他字段字符串，所得结果应为如下形式：

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/Users/yfan/Downloads/dsc20170801_jar/releases/com/netfinworks/ufs/ufs-client/


解决方法：

1、使用sed

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[root@www ~]# b="/Users/yfan/Downloads/dsc20170801_jar/releases/com/netfinworks/ufs/ufs-client/2.0.0/ufs-client-2.0.0.jar"
[root@www ~]# a=`echo "/Users/yfan/Downloads/dsc20170801_jar/releases/com/netfinworks/ufs/ufs-client/2.0.0/ufs-client-2.0.0.jar" |awk -F'/' '{print $(NF-1)"/"$NF}'`
[root@www ~]# echo $b|sed -n "s#$a##gp"
/Users/yfan/Downloads/dsc20170801_jar/releases/com/netfinworks/ufs/ufs-client/


2、使用awk

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[root@www ~]# b="/Users/yfan/Downloads/dsc20170801_jar/releases/com/netfinworks/ufs/ufs-client/2.0.0/ufs-client-2.0.0.jar"
[root@www ~]# echo $b |awk -F'/' '{gsub($(NF-1)"/"$NF,"");print}'
/Users/yfan/Downloads/dsc20170801_jar/releases/com/netfinworks/ufs/ufs-client/