hadoop dfs的小技巧
在测试hadoop的dfs的各种命令的时候，突然发现dfs -rmr支持通配符操作（前提是要在hadoop的bin目录下执行）
补充点：ls cat也支持通配符的
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例如执行ls后有如下文件
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[dikar@dikar ~]$ hadoop dfs -lsopts= -Dhadoop.log.dir=/home/dikar/Program/hadoop-0.20.2/bin/../logs -Dhadoop.log.file=hadoop.log -Dhadoop.home.dir=/home/dikar/Program/hadoop-0.20.2/bin/.. -Dhadoop.id.str= -Dhadoop.root.logger=INFO,console -Djava.library.path=/home/dikar/Program/hadoop-0.20.2/bin/../lib/native/Linux-i386-32 -Dhadoop.policy.file=hadoop-policy.xmlclass=org.apache.hadoop.fs.FsShellparams=-lsFound 3 items-rw-r--r-- 2 dikar supergroup 622 2011-03-05 16:55 /user/dikar/ta-rw-r--r-- 2 dikar supergroup 9 2011-03-05 16:51 /user/dikar/test1-rw-r--r-- 2 dikar supergroup 10 2011-03-05 16:51 /user/dikar/test2
?然后执行rmr test*
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[dikar@dikar bin]$ hadoop dfs -rmr test*opts= -Dhadoop.log.dir=/home/dikar/Program/hadoop-0.20.2/bin/../logs -Dhadoop.log.file=hadoop.log -Dhadoop.home.dir=/home/dikar/Program/hadoop-0.20.2/bin/.. -Dhadoop.id.str= -Dhadoop.root.logger=INFO,console -Djava.library.path=/home/dikar/Program/hadoop-0.20.2/bin/../lib/native/Linux-i386-32 -Dhadoop.policy.file=hadoop-policy.xmlclass=org.apache.hadoop.fs.FsShellparams=-rmr test*Deleted hdfs://dikar:54310/user/dikar/test1Deleted hdfs://dikar:54310/user/dikar/test2
?在用ls 查看
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[dikar@dikar bin]$ hadoop dfs -lsopts= -Dhadoop.log.dir=/home/dikar/Program/hadoop-0.20.2/bin/../logs -Dhadoop.log.file=hadoop.log -Dhadoop.home.dir=/home/dikar/Program/hadoop-0.20.2/bin/.. -Dhadoop.id.str= -Dhadoop.root.logger=INFO,console -Djava.library.path=/home/dikar/Program/hadoop-0.20.2/bin/../lib/native/Linux-i386-32 -Dhadoop.policy.file=hadoop-policy.xmlclass=org.apache.hadoop.fs.FsShellparams=-lsFound 1 items-rw-r--r-- 2 dikar supergroup 622 2011-03-05 16:59 /user/dikar/ta?
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