Hadoop Pig fs 测试命令

Question

想知道这行是什么意思？四处搜索但找不到此命令的引用，

Pig.fs("test -e " + pathToCheck) == 0:

提前致谢，林

Answer 1

使用命令行工具并运行hadoop fs -help 得到:

-test -[defsz] <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.
    -z  return 0 if file <path> is zero bytes in size, else return 1.