【Hadoop】hdfs dfs -test命令

使用方法

hdfs dfs -test -[defswrz] <path> :
  Answer various questions about <path>, with result via exit status.
    -d  return 0 if <path> is a directory.
    -e  return 0 if <path> exists.
    -f  return 0 if <path> is a file.
    -s  return 0 if file <path> is greater         than zero bytes in size.
    -w  return 0 if file <path> exists         and write permission is granted.
    -r  return 0 if file <path> exists         and read permission is granted.
    -z  return 0 if file <path> is         zero bytes in size, else return 1.

获取返回值

$?
[示例]

[root@emr-worker-2 ~]# hadoop fs -test -e /tmp
[root@emr-worker-2 ~]# echo $?
0
[root@emr-worker-2 ~]# hadoop fs -test -e /tmp1
[root@emr-worker-2 ~]# echo $?
1

查看方法

hdfs dfs -help