Things only Vim can do easily

only-vim-can-do.md

1. Works even under the most spartan conditions (in a simple remote shell window such as xterm, putty), with syntax highlighting, function folding, tabs, buffers, and all that lightning fast
2. Delete lines matching pattern: g/pattern/d
3. Delete lines not matching pattern: g!/pattern/d
4. Sort buffer: :%sort
5. Filter buffer through command :%!sort -u
6. Delete from current line until end of file (try with a large file!)
7. Increment numeric values: C-a, C-x
8. Complete line pattern C-x C-l
9. Convert a DOS file (with CRLF line endings) to UNIX: :set ff=unix (and then save it)
10. Multiple marks, with m + register name, for example ma. Jump to a mark using ' + register name, for example 'a
11. Macros: record keystrokes, assign them to a particular key on the keyboard, and then play them back one or more times later. (With certain macros, the C-a trick above also comes in handy!)
12. Edit binary files (with a little help from xxd)