root@master:~# hadoop fs -ls / hadoop: command not found //如果出现这种情况说明环境变量没有配置，执行一下操作 root@master:~# gedit .bashrc //会弹出编辑框，然后添加如下文字 export HADOOP_HOME=/opt/hadoop-2.9.2 export PATH=${JAVA_HOME}/bin:$PATH export PATH=${HADOOP_HOME}/bin:/opt/hadoop-2.9.2/sbin:$PATH //save保存 root@master:~# source .bashrc //重新加载文件（这一步必不可少） root@master:~# hadoop fs -mkdir /test1 /test2 //同时创建两个文件，test1,test2 root@master:~# hadoop fs -ls / //查看HDFS当前路径 Found 2 items drwxr-xr-x - root supergroup 0 2021-11-20 20:31 /test1 drwxr-xr-x - root supergroup 0 2021-11-20 20:31 /test2 root@master:~# hadoop fs -mkdir -p /x/y/x //创建目录/x/y/x root@master:~# hadoop fs -lsr /x //查看x下面的目录 lsr: DEPRECATED: Please use 'ls -R' instead. drwxr-xr-x - root supergroup 0 2021-11-20 20:32 /x/y drwxr-xr-x - root supergroup 0 2021-11-20 20:32 /x/y/x root@master:~# hadoop fs -mkdir file:/home/hadoop/x //hdfs下创建本地路径/home/hadoop/x root@master:~# hadoop fs -lsr /x // 查看x下的路径 lsr: DEPRECATED: Please use 'ls -R' instead. drwxr-xr-x - root supergroup 0 2021-11-20 20:32 /x/y drwxr-xr-x - root supergroup 0 2021-11-20 20:32 /x/y/x root@master:~# hadoop fs -ls / Found 3 items drwxr-xr-x - root supergroup 0 2021-11-20 20:31 /test1 drwxr-xr-x - root supergroup 0 2021-11-20 20:31 /test2 drwxr-xr-x - root supergroup 0 2021-11-20 20:32 /x root@master:~# ls Desktop Documents Downloads Music Pictures Public Templates Videos root@master:~# cd root@master:~# ls Desktop Documents Downloads Music Pictures Public Templates Videos root@master:~# cd root@master:~# cd .. root@master:/# ls bin dev initrd.img lib64 mnt root snap tmp vmlinuz boot etc initrd.img.old lost+found opt run srv usr vmlinuz.old cdrom home lib media proc sbin sys var root@master:/# cd home root@master:/home# ls hadoop root@master:/home# hadoop fs -touchz /test1/abc.txt root@master:/home# hadoop fs -ls /test1 Found 1 items -rw-r--r-- 3 root supergroup 0 2021-11-20 20:38 /test1/abc.txt root@master:/home# echo "hello world" >> file1 root@master:/home# echo "hello old luo" >> file2 root@master:/home# ls file1 file2 hadoop root@master:/home# hadoop fs -appendToFile file1 file2 /test1/abc.txt root@master:/home# hadoop fs -ls /test1/abc.txt -rw-r--r-- 3 root supergroup 26 2021-11-20 20:42 /test1/abc.txt root@master:/home# hadoop fs -cat /test1/abc.txt hello world hello old luo root@master:/home# hadoop fs -cp file:/home/hadoop/file1 /x cp: `file:/home/hadoop/file1': No such file or directory root@master:/home# cp file1 /home/hadoop root@master:/home# ls file1 file2 hadoop root@master:/home# cd hadoop root@master:/home/hadoop# ls Desktop Downloads file1 Pictures Templates x Documents examples.desktop Music Public Videos root@master:/home/hadoop# hadoop fs -cp file:/home/hadoop/file1 /x root@master:/home/hadoop# hadoop fs -lsr /x lsr: DEPRECATED: Please use 'ls -R' instead. -rw-r--r-- 3 root supergroup 12 2021-11-20 20:50 /x/file1 drwxr-xr-x - root supergroup 0 2021-11-20 20:32 /x/y drwxr-xr-x - root supergroup 0 2021-11-20 20:32 /x/y/x root@master:/home/hadoop# hadoop fs -cp -p -f file:/home/hadoop/file1 /x root@master:/home/hadoop# hadoop fs -mv /x/file1 /x/file1.txt root@master:/home/hadoop# hadoop fs -lsr /x lsr: DEPRECATED: Please use 'ls -R' instead. -rw-r--r-- 3 root root 12 2021-11-20 20:49 /x/file1.txt drwxr-xr-x - root supergroup 0 2021-11-20 20:32 /x/y drwxr-xr-x - root supergroup 0 2021-11-20 20:32 /x/y/x root@master:/home/hadoop# hadoop fs -lsr /text lsr: DEPRECATED: Please use 'ls -R' instead. lsr: `/text': No such file or directory root@master:/home/hadoop# hadoop fs -lsr /text1 lsr: DEPRECATED: Please use 'ls -R' instead. lsr: `/text1': No such file or directory root@master:/home/hadoop# cd .. root@master:/home# ls file1 file2 hadoop root@master:/home# cd .. root@master:/# ls bin dev initrd.img lib64 mnt root snap tmp vmlinuz boot etc initrd.img.old lost+found opt run srv usr vmlinuz.old cdrom home lib media proc sbin sys var root@master:/# hadoop fs -ls / Found 3 items drwxr-xr-x - root supergroup 0 2021-11-20 20:38 /test1 drwxr-xr-x - root supergroup 0 2021-11-20 20:31 /test2 drwxr-xr-x - root supergroup 0 2021-11-20 20:54 /x root@master:/# hadoop fs -ls /test1 Found 1 items -rw-r--r-- 3 root supergroup 26 2021-11-20 20:42 /test1/abc.txt root@master:/# hadoop fs -mv /test1 /x/y root@master:/# hadoop fs -ls /x Found 2 items -rw-r--r-- 3 root root 12 2021-11-20 20:49 /x/file1.txt drwxr-xr-x - root supergroup 0 2021-11-20 20:58 /x/y root@master:/# cd /x bash: cd: /x: No such file or directory root@master:/# cd x bash: cd: x: No such file or directory root@master:/# hadoop fs -ls x ls: `x': No such file or directory root@master:/# hadoop fs -ls /x Found 2 items -rw-r--r-- 3 root root 12 2021-11-20 20:49 /x/file1.txt drwxr-xr-x - root supergroup 0 2021-11-20 20:58 /x/y root@master:/# hadoop fs -ls /x/y Found 2 items
