HDFS文件系统的基本操作，hadoop基本命令的使用
hdfs命令行客户端的常用操作命令
1 查看hdfs中的目录信息
2 上传文件到hdfs中
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| hadoop fs -put /本地文件 /aaa
hadoop fs -copyFromLocal /本地文件 /hdfs路径 ## copyFromLocal等价于 put
hadoop fs -moveFromLocal /本地文件 /hdfs路径 ## 跟copyFromLocal的区别是：从本地移动到hdfs中
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3 下载文件到客户端本地磁盘
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| hadoop fs -get /hdfs中的路径 /本地磁盘目录
hadoop fs -copyToLocal /hdfs中的路径 /本地磁盘路径 ## 跟get等价
hadoop fs -moveToLocal /hdfs路径 /本地路径 ## 从hdfs中移动到本地
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4 在hdfs中创建文件夹
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| hadoop fs -mkdir -p /aaa/xxx
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5 移动hdfs中的文件（更名）
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| hadoop fs -mv /hdfs的路径 /hdfs的另一个路径
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6 删除hdfs中的文件或文件夹
7 修改文件的权限
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| hadoop fs -chown user:group /aaa
hadoop fs -chmod 700 /aaa
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追加内容到已存在的文件
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| hadoop fs -appendToFile /本地文件 /hdfs中的文件
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8 显示文本文件的内容
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| hadoop fs -cat /hdfs中的文件
hadoop fs -tail /hdfs中的文件
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9 其他命令
hdfs命令行客户端的所有命令列表
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| Usage: hadoop fs [generic options]
[-appendToFile <localsrc> ... <dst>]
[-cat [-ignoreCrc] <src> ...]
[-checksum <src> ...]
[-chgrp [-R] GROUP PATH...]
[-chmod [-R] <MODE[,MODE]... | OCTALMODE> PATH...]
[-chown [-R] [OWNER][:[GROUP]] PATH...]
[-copyFromLocal [-f] [-p] [-l] [-d] <localsrc> ... <dst>]
[-copyToLocal [-f] [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
[-count [-q] [-h] [-v] [-t [<storage type>]] [-u] [-x] <path> ...]
[-cp [-f] [-p | -p[topax]] [-d] <src> ... <dst>]
[-createSnapshot <snapshotDir> [<snapshotName>]]
[-deleteSnapshot <snapshotDir> <snapshotName>]
[-df [-h] [<path> ...]]
[-du [-s] [-h] [-x] <path> ...]
[-expunge]
[-find <path> ... <expression> ...]
[-get [-f] [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
[-getfacl [-R] <path>]
[-getfattr [-R] {-n name | -d} [-e en] <path>]
[-getmerge [-nl] [-skip-empty-file] <src> <localdst>]
[-help [cmd ...]]
[-ls [-C] [-d] [-h] [-q] [-R] [-t] [-S] [-r] [-u] [<path> ...]]
[-mkdir [-p] <path> ...]
[-moveFromLocal <localsrc> ... <dst>]
[-moveToLocal <src> <localdst>]
[-mv <src> ... <dst>]
[-put [-f] [-p] [-l] [-d] <localsrc> ... <dst>]
[-renameSnapshot <snapshotDir> <oldName> <newName>]
[-rm [-f] [-r|-R] [-skipTrash] [-safely] <src> ...]
[-rmdir [--ignore-fail-on-non-empty] <dir> ...]
[-setfacl [-R] [{-b|-k} {-m|-x <acl_spec>} <path>]|[--set <acl_spec> <path>]]
[-setfattr {-n name [-v value] | -x name} <path>]
[-setrep [-R] [-w] <rep> <path> ...]
[-stat [format] <path> ...]
[-tail [-f] <file>]
[-test -[defsz] <path>]
[-text [-ignoreCrc] <src> ...]
[-touchz <path> ...]
[-truncate [-w] <length> <path> ...]
[-usage [cmd ...]]
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