启动hadoop
[root@centos local]# start-all.sh查看进程
[root@centos local]# jps 3310 JobTracker 3008 NameNode 3120 DataNode 3471 TaskTracker 3230 SecondaryNameNode 3562 Jpshdfs命令都是以hadoop fs开头的，-ls表示查看hdfs目录，hdfs://centos:9000/是配置文件core-site.xml中所配置的地址，“/“表示根路径
[root@centos local]# hadoop fs -ls hdfs://centos:9000/ Warning: $HADOOP_HOME is deprecated. Found 1 items drwxr-xr-x - root supergroup 0 2015-05-19 11:08 /usr更简单的查询方式是省略路径，会通过core-site.xml自行查找hdfs路径
root@centos /]# hadoop fs -ls /递归查看文件目录结构
[root@centos /]# hadoop fs -lsr hdfs://centos:9000/ arning: $HADOOP_HOME is deprecated. drwxr-xr-x - root supergroup 0 2015-05-19 11:08 /usr drwxr-xr-x - root supergroup 0 2015-05-19 11:08 /usr/local drwxr-xr-x - root supergroup 0 2015-05-19 11:08 /usr/local/hadoop drwxr-xr-x - root supergroup 0 2015-05-19 11:08 /usr/local/hadoop/tmp drwxr-xr-x - root supergroup 0 2015-05-20 04:18 /usr/local/hadoop/tmp/mapred drwx------ - root supergroup 0 2015-05-20 04:18 /usr/local/hadoop/tmp/mapred/system -rw------- 1 root supergroup 4 2015-05-20 04:18 /usr/local/hadoop/tmp/mapred/system/jobtracker.info创建一个文件夹，名称为file1
[root@centos /]# hadoop fs -mkdir /file1 Warning: $HADOOP_HOME is deprecated. [root@centos /]# hadoop fs -ls / Warning: $HADOOP_HOME is deprecated. Found 2 items drwxr-xr-x - root supergroup 0 2015-05-20 04:48 /file1 drwxr-xr-x - root supergroup 0 2015-05-19 11:08 /us上传文件，使用-put <源文件> <目标路径>
[root@centos /]# hadoop fs -put /usr/local/hadoop-1.1.2/conf/core-site.xml /file1 [root@centos /]# hadoop fs -ls /file1 Warning: $HADOOP_HOME is deprecated. Found 1 items -rw-r--r-- 1 root supergroup 409 2015-05-20 04:54 /file1/core-site.xml下载文件，使用-get <源文件> <目标路径>
[root@centos /]# hadoop fs -get /file1/core-site.xml /root/Desktop Warning: $HADOOP_HOME is deprecated.查看文件内容
[root@centos /]# hadoop fs -text /file1/core-site.xml
Warning: $HADOOP_HOME is deprecated.
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://192.168.56.101:9000</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/usr/local/hadoop/tmp</value>
</property>
</configuration>
删除文件，-rm只能删文件，不能删目录，递归删除-rmr
[root@centos /]# hadoop fs -rm/file1/core-site.xml [root@centos /]# hadoop fs -rmr/file1命令帮助，查看ls命令
[root@centos /]# hadoop fs -help ls
Warning: $HADOOP_HOME is deprecated.
-ls <path>: List the contents that match the specified file pattern. If
path is not specified, the contents of /user/<currentUser>
will be listed. Directory entries are of the form
dirName (full path) <dir>
and file entries are of the form
fileName(full path) <r n> size
where n is the number of replicas specified for the file
and size is the size of the file, in bytes. 总结
-help [cmd] //显示命令的帮助信息 -ls(r) <path> //显示当前目录下所有文件 -du(s) <path> //显示目录中所有文件大小 -count[-q] <path> //显示目录中文件数量 -mv <src> <dst> //移动多个文件到目标目录 -cp <src> <dst> //复制多个文件到目标目录 -rm(r) //删除文件(夹) -put <localsrc> <dst> //本地文件复制到hdfs -copyFromLocal //同put -moveFromLocal //从本地文件移动到hdfs -get [-ignoreCrc] <src> <localdst> //复制文件到本地，可以忽略crc校验 -getmerge <src> <localdst> //将源目录中的所有文件排序合并到一个文件中 -cat <src> //在终端显示文件内容 -text <src> //在终端显示文件内容 -copyToLocal [-ignoreCrc] <src> <localdst> //复制到本地 -moveToLocal <src> <localdst> -mkdir <path> //创建文件夹 -touchz <path> //创建一个空文件