1. Useful Linux Commands

2. cd (Change Directory) Enables you to navigate to another directory
Example: cd Downloads
Example: cd /etc/
Example: cd (Directory up!)
note: After you have typed cd and entering the first or two letters of the directory you can press the TAB key to auto-complete the directory!

3. man ( Manual Page)
Shows the "manual" of the command for detailed explanation.
In some situation you might need to get more information about the command you are using.
The man command shows you this information about the command.
Example: man cp

4. ls ( List directory contents )
Used to list the files/directories within a directory.
Example: ls
It shows the directories available. Can use -al argument to list hidden files and permissions for each directory/file.

5. cp ( Copy ) The cp command is available for us to duplicate files;
Example: cp file1 file2
note: file1 is the file the user wants to be copied... file2 is the name of the copied file (new file/destination file).

6. mv (Move)
Enables the users to move a file/directory to a specified location.
Example:
mv /home/me/Desktop/src /home/me/Desktop/dst
note: The first part of the command is the file that has to be moved. The second part (after the whitespace) is the target directory.

7. rmdir ( Remove Directory)
Removing directories is done by the rmdir command
Example: rmdir folder
note: When the directory is not empty the command will give an error message:
rmdir: failed to remove `folder': Directory not empty
So, make sure folder is completely empty before removing it.

8. touch The touch command is used to make files.
Example: touch vogel
This will create the file vogel for us in the current working directory.

9. rm ( Remove)
The rm command is used to delete files instead of directories.
Example: rm vogel
note: To remove files you must have the right permission bits set on the specific file.

10. pwd (Print Working Directory)
Sometimes you really wonder which directory you are in. PWD is the solution for that problem.
Example: pwd

11. gcc Compile a c program into an executable gcc –o exefile file.c
exefile is executable file to be created
file.c is the c file to be compiled

12. xemacs
Editor for working with a variety of file types including c files
It has a Graphical User Interface
xemacs file1.c