I'm new to Linux or UNIX like operating system. I just wanted to create a file called demo.txt and save & close it using vi text editor. How do I save a file using vi?
The vi or vim is a text editor which has three modes: command mode, input mode, and ex mode. To create a new file open a terminal and then type:
$ vi demo.txt
vi / vim always begins in command mode. You can press [Esc] key anytime to return to command mode. Press i to insert text. To save and exit from vi / vim, press [Esc] key and type ZZ:
To see list of your saved file, enter:
$ cat demo.txt
vi ex Mode File Saving Commands
To get into the ex mode, press [Esc] key and then : (the colon). For example, to exit from vi saving changes, press [Esc], : (colon) and type wq:
You can also quit, discard all changes by pressing [Esc], : (colon) and q!.
Common Vi / Vim File Savings Related Commands (ex mode)
You need to press [Esc] key followed by the colon (:) before typing the following commands:
|q!||Quit without saving changes i.e. discard changes|
|r fileName||Read data from file called fileName|
|wq||Write and quit (save and exit)|
|w fileName||Write to file called fileName (save as)|
|w! fileName||Overwrite to file called fileName (save as forcefully)|
See Vi editor command keys wiki page for more information.