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

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

Automatically write (save) 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 the directory in which ex stores buffer files. (Directory must be writable.)

Use ed-like features on substitute commands.

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

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.

Abolish carriage returns at the end of lines when printing multiple lines, speeds output on dumb terminals when printing lines with leading white space (blanks or tabs).

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

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

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

Terminal redraws 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 ESC.

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

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

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

Define number of spaces in backward (^D) tabs when using the autoindent option.

In vi, when ) or } is entered, cursor moves briefly to matching ( or {. (If match is not on the screen, rings the error message bell.) Very useful for programming.

In insert mode, displays 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 that 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.

Define pathname of files containing tags (see the UNIX ctags command.) By default, the system looks for files tags (in the current directory) and /usr/lib/tags.

Display the 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.

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