📅 最后修改于: 2020-12-01 06:41:23 🧑 作者: Mango
“ $ HADOOP_HOME / bin / hadoop fs”中的命令比此处演示的要多，尽管这些基本操作可以帮助您入门。在不使用其他参数的情况下运行./bin/hadoop dfs将列出可以在FsShell系统上运行的所有命令。此外，如果您遇到问题， $ HADOOP_HOME / bin / hadoop fs -help commandName将显示有关操作的简短用法摘要。
所有操作的表格如下所示。以下约定用于参数-
"" means any file or directory name.
"..." means one or more file or directory names.
"" means any filename.
"" and "" are path names in a directed operation.
"" and "" are paths as above, but on the local file system.
所有其他文件和路径名均引用HDFS中的对象。
| Sr.No | Command & Description |
|---|---|
| 1 |
-ls Lists the contents of the directory specified by path, showing the names, permissions, owner, size and modification date for each entry. |
| 2 |
-lsr Behaves like -ls, but recursively displays entries in all subdirectories of path. |
| 3 |
-du Shows disk usage, in bytes, for all the files which match path; filenames are reported with the full HDFS protocol prefix. |
| 4 |
-dus Like -du, but prints a summary of disk usage of all files/directories in the path. |
| 5 |
-mv Moves the file or directory indicated by src to dest, within HDFS. |
| 6 |
-cp Copies the file or directory identified by src to dest, within HDFS. |
| 7 |
-rm Removes the file or empty directory identified by path. |
| 8 |
-rmr Removes the file or directory identified by path. Recursively deletes any child entries (i.e., files or subdirectories of path). |
| 9 |
-put Copies the file or directory from the local file system identified by localSrc to dest within the DFS. |
| 10 |
-copyFromLocal Identical to -put |
| 11 |
-moveFromLocal Copies the file or directory from the local file system identified by localSrc to dest within HDFS, and then deletes the local copy on success. |
| 12 |
-get [-crc] Copies the file or directory in HDFS identified by src to the local file system path identified by localDest. |
| 13 |
-getmerge Retrieves all files that match the path src in HDFS, and copies them to a single, merged file in the local file system identified by localDest. |
| 14 |
-cat Displays the contents of filename on stdout. |
| 15 |
-copyToLocal Identical to -get |
| 16 |
-moveToLocal Works like -get, but deletes the HDFS copy on success. |
| 17 |
-mkdir Creates a directory named path in HDFS. Creates any parent directories in path that are missing (e.g., mkdir -p in Linux). |
| 18 |
-setrep [-R] [-w] rep Sets the target replication factor for files identified by path to rep. (The actual replication factor will move toward the target over time) |
| 19 |
-touchz Creates a file at path containing the current time as a timestamp. Fails if a file already exists at path, unless the file is already size 0. |
| 20 |
-test -[ezd] Returns 1 if path exists; has zero length; or is a directory or 0 otherwise. |
| 21 |
-stat [format] Prints information about path. Format is a string which accepts file size in blocks (%b), filename (%n), block size (%o), replication (%r), and modification date (%y, %Y). |
| 22 |
-tail [-f] Shows the last 1KB of file on stdout. |
| 23 |
-chmod [-R] mode,mode,… Changes the file permissions associated with one or more objects identified by path…. Performs changes recursively with R. mode is a 3-digit octal mode, or {augo}+/-{rwxX}. Assumes if no scope is specified and does not apply an umask. |
| 24 |
-chown [-R] [owner][:[group]] Sets the owning user and/or group for files or directories identified by path…. Sets owner recursively if -R is specified. |
| 25 |
-chgrp [-R] group Sets the owning group for files or directories identified by path…. Sets group recursively if -R is specified. |
| 26 |
-help Returns usage information for one of the commands listed above. You must omit the leading ‘-‘ character in cmd. |