Useful Commands in Ubuntu

• ls Lists the current directory.
  It’s like the MS-DOS dir command.
• ls dir Lists the specified directory.
• cat file Concatenates (adds) the contents of the file to your screen.
  It’s like the MS-DOS type command.
• more file Displays the file one page at a time.
• tail file Displays the file one page at a time from the end of the file.
• pwd Shows name of the current directory.
• cd dir Changes to the specified directory.
  It’s like the MS-DOS chdir command.

mv: Short for move, this command can be used to move your files from one folder to another. 

rm: Short for remove, this command is used to remove any files or folders. 

cd: Short for change, you can use this command to change your current directory. 

cp: Short for copy, this command can be used to copy files or folders in a directory. 

chown: This command is used to change ownership of a file. 

chmod: This command is used to change permissions on a file. 

ls: Short for list, this command can be used to view all of the files and folders in your current working directory. 

pwd: Short for print working directory, this command can be used to display the directory in which you are currently working. 

sudo: Also referred to as superuser do, a sudo command allows you to run other commands with administrative privileges. This command is especially useful for modifying files in a directory that a user wouldn't necessarily have access to. 

cd: Short for change directory, this command can be used to change the directory in which you are currently working. There are a variety of cd commands that can be used to take you to specific files or folders. 

cd / : An alternate to a basic cd command, the cd / command can be used to take you to the root directory. 

cd .. : This command can be used to take you up one directory level. 

cd - : This command can be used to navigate to a previous directory.