wojiaodoubao commented on a change in pull request #1993:
URL: https://github.com/apache/hadoop/pull/1993#discussion_r490822258
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File path:
hadoop-common-project/hadoop-common/src/site/markdown/FileSystemShell.md
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@@ -824,6 +824,19 @@ Example:
* `hadoop fs -truncate 55 /user/hadoop/file1 /user/hadoop/file2`
* `hadoop fs -truncate -w 127 hdfs://nn1.example.com/user/hadoop/file1`
+concat
+--------
+
+Usage: `hadoop fs -concat <target file> <source files>`
+
+Concatenate existing source files into the target file. Target file and source
+files should be in the same directory.
+
+Example:
+
+* `hadoop fs -concat /user/hadoop/target-file /user/hadoop/file-0
/user/hadoop/file-1`
+* `hadoop fs -concat /user/hadoop/target-file /user/hadoop/file-*`
Review comment:
I didn't understand with the expansion locally part. I think the
expansion would be done by org.apache.hadoop.fs.shell.Command so even not using
'bash' the expansion would still work correctly? Sorry if I understand it
wrong. A more detailed explanation would be very helpful.
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