Vim tips: Working with external commands
Vim is a powerful editing tool, but there are some things it just can't do. However, Vim lets you access shell commands and utilities without leaving Vim, and that lets you perform some amazing tricks.
If you run :shell or just :sh while you're in the editor, Vim (or Gvim, if you're partial to Vim's GUI) will place you in an interactive shell. You can run whatever commands you want, and resume your Vim session by exiting the shell.
As most other *nix applications, you can also pause Vim with Ctrl-z, which will drop you back to the shell. When you're finished, you can resume Vim with fg. (This is a feature of the shell, not a Vim feature.)
Have you ever started editing a file, made a bunch of changes, and then typed to write your changes, only to find that the file is read-only? You can deal with that in a couple of ways, but one of the easiest things to do is to invoke a shell from within Vim and change the file's permissions before you save it again.
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