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hadoop判断文件是否存在

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Release: 2016-06-07 14:58:55
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hadoop判断文件是否存在 在shell中判断一个HDFS目录/文件是否存在 直接看shell代码: hadoop fs -test -e /hdfs_dir if [ $? -ne 0 ]; then echo Directory not exists! fi hadoop fs -test -e 用于判断HDFS目录/文件是否存在,下一步检测该命令的返回值,以

hadoop判断文件是否存在

 

在shell中判断一个HDFS目录/文件是否存在

 

直接看shell代码:

 

hadoop fs -test -e /hdfs_dir

if [ $? -ne 0 ]; then

    echo "Directory not exists!"

fi

hadoop fs -test -e 用于判断HDFS目录/文件是否存在,下一步检测该命令的返回值,以确定其判断结果。

 

-test -[ezd] : If file { exists, has zero length, is a directory

then return 0, else return 1.

 

e,z,d参数必用其一,不可缺少。

 

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