| Abbreviations[1] | |
| :mapx sequence | Define keystroke x as a command sequence | 
| :map!x sequence | Define x as command sequence for insert mode | 
| :unmapx | Disable the map x | 
| :unmap!x | Disable insert mode map x | 
| :ababbrphrase | Abbreviate phrase as abbr; when abbr is typed in insert mode, it expands to full words or phrases | 
| :unababbr | Disable abbreviation | 
| Customizing environment: [1] | |
| :setoption | Activate option | 
| :setoption=value | Assign value to option | 
| :set nooption | Deactivate option | 
| :set | Display options set by user | 
| :set all | Display list of all current options, both default and those set by the user | 
| :setoption? | Display value of option | 
| : | Invoke ex from vi editor | 
| :vi | Invoke vi editor from ex | 
| :sh | Invoke shell | 
| ^D | Return to editor from shell | 
| :!command | Give UNIX command | 
| :rnewfile | Read contents of newfile into current file | 
| :r !command | Read output of UNIX command into current file | 
[1] In .exrc files, omit colon at the start of ex commands.
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