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Hadoop HDSF File system commands given in this post. These are useful for your projects and interviews. HDFS commands HDFS File System Commands. Hadoop fs -cmd <args> cmd is a specific command and arg is the variable name.  The List of Commands cat  Hadoop fs –cat FILE [FILE …]  Displays the files' content. For reading compressed files.  chgrp  Hadoop fs –chgrp [-R] GROUP PATH [PATH …]  Changes the group association for files and directories. The – R option applies the change recursively.  The user must be the files' owner or a superuser.  chmod  Hadoop fs –chmod [-R] MODE[,MODE …] PATH [PATH …]  Changes the permissions of files and directories. Like, its Unix equivalent, MODE can be a 3-digit octal mode, or {augo}+/-{rwxX}. The -R option applies the change recursively. The user must be the files' owner or a superuser.  chown  Hadoop fs –chown [-R] [OWNER][:[GROUP]] PATH [PATH…]  Changes the ownership of files and directories. The –R option applies the change recursiv

I have given VI editor commands to use in Ubuntu operating system. You can practice using them for your benefit and you can complete your work quickly. To begin changing or adding to text with vi, you can enter Insert or Replace modes, as shown in the following list. When you enter Insert or Replace mode, the characters you type will appear in the text document (as opposed to being interpreted as commands).  vi filename This is the first command to enter into editor mode. Once you enter into editor mode, you need to enter other commands to complete your editing work. Press the Esc key t o exit to Normal mode after you are done inserting or replacing text. List of VI Editor Commands.. i—Typed text appears before current character. a—Typed text appears after current character. o—Open a new line below current line to begin typing. s—Erase current character and replace with new text. c?—Replace ? with l, w, $, or c to change the current letter, word, end of line, or line. r—Repla