Hadoop读书笔记（二）HDFS的shell操作

Hadoop读书笔记（一）Hadoop介绍：http://blog.csdn.net/caicongyang/article/details/39898629

1.shell操作

1.1所有的HDFS shell操作命名可以通过hadoop fs获取：

[root@hadoop ~]# hadoop fs
Usage: java FsShell
           [-ls <path>]
           [-lsr <path>]
           [-du <path>]
           [-dus <path>]
           [-count[-q] <path>]
           [-mv <src> <dst>]
           [-cp <src> <dst>]
           [-rm [-skipTrash] <path>]
           [-rmr [-skipTrash] <path>]
           [-expunge]
           [-put <localsrc> ... <dst>]
           [-copyFromLocal <localsrc> ... <dst>]
           [-moveFromLocal <localsrc> ... <dst>]
           [-get [-ignoreCrc] [-crc] <src> <localdst>]
           [-getmerge <src> <localdst> [addnl]]
           [-cat <src>]
           [-text <src>]
           [-copyToLocal [-ignoreCrc] [-crc] <src> <localdst>]
           [-moveToLocal [-crc] <src> <localdst>]
           [-mkdir <path>]
           [-setrep [-R] [-w] <rep> <path/file>]
           [-touchz <path>]
           [-test -[ezd] <path>]
           [-stat [format] <path>]
           [-tail [-f] <file>]
           [-chmod [-R] <MODE[,MODE]... | OCTALMODE> PATH...]
           [-chown [-R] [OWNER][:[GROUP]] PATH...]
           [-chgrp [-R] GROUP PATH...]
           [-help [cmd]]

Generic options supported are
-conf <configuration file>     specify an application configuration file
-D <property=value>            use value for given property
-fs <local|namenode:port>      specify a namenode
-jt <local|jobtracker:port>    specify a job tracker
-files <comma separated list of files>    specify comma separated files to be copied to the map reduce cluster
-libjars <comma separated list of jars>    specify comma separated jar files to include in the classpath.
-archives <comma separated list of archives>    specify comma separated archives to be unarchived on the compute machines.


The general command line syntax is
bin/hadoop command [genericOptions] [commandOptions]

1.2常见操作

所有的HDFS操作均以hadoop fs开头加上相对应的操作

1.2.1列出HDFS文件下面所有的文件

[root@hadoop ~]# hadoop fs -ls hdfs://hadoop:9000/

hdfs://hadoop:9000 为hadoop配置文件core-site.xml中配置的默认的文件系统名称，上述命令可以简写为：

[root@hadoop ~]# hadoop fs -ls /

1.2.1文件上传：讲Llinux下的/usr/local/hadoop-1.1.2.tar.gz上传到hdfs下的/download文件夹下

[root@hadoop ~]# hadoop fs -ls /usr/local/hadoop-1.1.2.tar.gz  /download

1.2.2查看上传的文件：循环列出/download下面的所有文件

[root@hadoop ~]# hadoop fs -lsr  /download

1.3HDFS shell操作命令帮助

[root@hadoop ~]# hadoop fs -help chown

-chown [-R] [OWNER][:[GROUP]] PATH...
                Changes owner and group of a file.
                This is similar to shell‘s chown with a few exceptions.

        -R      modifies the files recursively. This is the only option
                currently supported.

                If only owner or group is specified then only owner or
                group is modified.

                The owner and group names may only cosists of digits, alphabet,
                and any of ‘-_.@/‘ i.e. [-_.@/a-zA-Z0-9]. The names are case
                sensitive.

                WARNING: Avoid using ‘.‘ to separate user name and group though
                Linux allows it. If user names have dots in them and you are
                using local file system, you might see surprising results since
                shell command ‘chown‘ is used for local files.

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