In insert mode, indent each line to the same level as the line above or below. Use with the shiftwidth option.

Display changes after each editor command. (For global replacement, display last replacement.)

Automatically write (save) the file if changed before opening another file with :n or before giving Unix command with :!.

Ignore all control characters during input (except tab, newline, or formfeed).

Name directory in which ex/vi stores buffer files. (Directory must be writable.)

noedcompatible

Remember the flags used with the most recent substitute command (global, confirming) and use them for the next substitute command. Despite the name, no version of ed actually behaves this way.

Allow the execution of .exrc files that reside outside the user's home directory.

Define boundaries for terminal hardware tabs.

Disregard case during a search.

Insert indents in appropriate Lisp format. ( ), { }, [[, and ]] are modified to have meaning for Lisp.

Print tabs as ^I; mark ends of lines with $. (Use list to tell if end character is a tab or a space.)

Wildcard characters . (dot), * (asterisk), and [] (brackets) have special meaning in patterns.

Permit system messages to display on terminal while editing in vi.

Require the use of long ex command names, such as copy or read.

Display line numbers on left of screen during editing session.

Allow entry to open or visual mode from ex. Although not in Solaris vi, this option has traditionally been in vi, and may be in your Unix's version of vi.

Abolish carriage returns at the end of lines when printing multiple lines; speed output on dumb terminals when printing lines with leading whitespace (spaces or tabs).

IPLPPPQP LIpplpipbp

Define paragraph delimiters for movement by { or }. The pairs of characters in the value are the names of troff macros that begin paragraphs.

Display the ex prompt (:) when vi's Q command is given.

Any writes (saves) of a file fail unless you use ! after the write (works with w, ZZ, or autowrite).

vi redraws the screen whenever edits are made (in other words, insert mode pushes over existing characters, and deleted lines immediately close up). Default depends on line speed and terminal type. noredraw is useful at slow speeds on a dumb terminal: deleted lines show up as @, and inserted text appears to overwrite existing text until you press Escape.

Allow nested map sequences.

Display a message on the status line whenever you make an edit that affects at least a certain number of lines. For example, 6dd reports the message "6 lines deleted."

Number of lines to scroll with ^D and ^U commands.

Define section delimiters for [[ and ]] movement. The pairs of characters in the value are the names of troff macros that begin sections.

Pathname of shell used for shell escape (:!) and shell command (:sh). Default value is derived from shell environment, which varies on different systems.

Define number of spaces in backward (^D) tabs when using the autoindent option, and for the << and >> commands.

In vi, when ) or } is entered, cursor moves briefly to matching ( or {. (If no match, rings the error message bell.) Very useful for programming.

In insert mode, display a message on the prompt line indicating the type of insert you are making. For example, "OPEN MODE" or "APPEND MODE."

Hold off display during insert. Default depends on line speed and terminal type.

Define number of spaces a tab indents during editing session. (Printer still uses system tab of 8.)

Define number of characters that are significant for tags. Default (zero) means that all characters are significant.

tags /usr/lib/tags

Define pathname of files containing tags. (See the Unix ctags command.) (By default, vi searches the file tags in the current directory and /usr/lib/tags.)

Enable stacking of tag locations on a stack.

Display shorter error messages.

Keyboard maps time out after 1 second.[1]

Set terminal type. This is just another name for term.

Display the warning message, "No write since last change."

Show a certain number of lines of the file on the screen. Default depends on line speed and terminal type.

Searches wrap around either end of file.

Define right margin. If greater than zero, automatically insert carriage returns to break lines.