Nano

 Nano is a text editor for Linux using a command line interface. Simple terminal  based text editor.

The following are some commands in Nano:

1. Ctrl + o- It used to save the current file.
2. Ctrl + g - Help
3. Ctrl + k - Cut a sentence or paragraph
4. Ctrl + u - Uncut: It undo the cut command
5. Ctrl + j  - It justify the paragraph or sentence according to our work.
6. Alt   + a - It used to highlight a word or sentence in a paragraph
7. Ctrl + x - It used to exit from nano
8. Ctrl + e - It used to move the cursor to the last of the current sentence.
9. Crtl + h - It used to delete a character from back
10. Ctrl + 6 - It used to highlight a word or sentence in a paragraph
11. Ctrl + a - It bring the cursor to the first of the current sentence
12. Ctrl + d - It used to delete a character from front like delete button
13. Ctrl + f -  It moves next from current letter
14. Ctrl + b - move back from current letter
15. Ctrl + r - open/ read a file
16. Ctrl +w - search in terminal
17. Ctrl +c - cancel the current command
18. Ctrl +x - Exit from nano
19. Ctrl + / - It move the cursor to the line we want
20. Ctrl +n - It move the cursor to down 
21. Ctrl +p - It move the cursor to up
22. Ctrl +z - Direct exit.