| | T
- ~t command (mailx)
, 
- -t option (lp command)
, 
- -t option (lpstat command)
, , 
- TC shell
- command for
,  - command prompt for
, ,  - environment variables for
- See .tcshrc file
- help for
,  - home directory specification
,  - repeating commands and
,  - user profile file for
- See .tcshrc file
- tcsh command
, 
- .tcshrc file
- environment variables in
- commonly used
,  - alias
,  - set commands
, ,  - umask (file permissions)
,  - history
, 
- location of
, 
- temporary files, deleting
, 
- TERM environment variable
, 
- terminals
- environment variables for
, ,  - from which command started
, 
- terminating
- See quitting
- TERMINFO environment variable
, 
- text mode (vi)
, , 
- tilde (~)
- aborting remote connection
,  - home directory specifier
, ,  - in mail
,  - suspending remote connection
,  - vi case toggle
,  - vi editing screen marker
, 
- tilde commands (mailx)
- inserting a message
,  - listing
,  - literal tilde entry
,  - overview
,  - replying to email
,  - sending carbon copies
, ,  - starting vi while composing email
,  - summary of
,  - viewing a complete message
, 
- time zone, setting
, 
- titling printouts (lp)
, 
- To: prompt (mailx)
, , 
- toggling
- See changing
- top of screen, moving to (vi)
, 
- touch command
, 
- traced state
, 
- troff program
, 
- troubleshooting, vi
, 
- typing mistakes
- See correcting typing mistakes
- TZ environment variable
, 
U
- u command
- mailx
,  - vi
, 
- :u command (ex)
, 
- U command (vi)
, 
- -u option (lpstat command)
, 
- umask command
, , 
- undeleting mail
, 
- undeliverable messages
, 
- Undo operation, keyboard equivalent
, 
- undoing changes (vi)
, , 
- undoing keyboard remapping
- IA
, ,  - SPARC
, , 
- undoing undo
- keyboard equivalent
,  - vi
, 
- uppercase
- See case sensitivity
- user-based access control
, , , 
- User category
, 
- user names, defined
, 
- -user option (find command)
, 
- user profile file
- defined
,  - environment variables in
, ,  - location of
, 
- user types, for setting permissions
, 
- /usr/openwin/bin/xauth program
, , , 
V
- ~v command (mailx)
, 
- -v option
- grep command
,  - lpstat command
, 
- /var/mail directory
, 
- version number, mailx program
, , 
- vertical bar (|), pipe symbol
, 
- vi editor
, ,  - appending text
,  - buffers
,  - Caps Lock key and
,  - case sensitivity
- command names
, ,  - searches
, 
- case toggle
,  - changing text
, , ,  - command mode
,  - commands
- case sensitivity
, ,  - entering
,  - repeating
,  - summary of
, , 
- copying lines
- ex command
, ,  - vi commands
, , 
- creating files
,  - cursor movement
- See moving around in files
- deleting text
- ex command
, ,  - vi commands
, 
- described
,  - editing screen
, ,  - entry mode
, ,  - Esc key and
,  - ex commands and
- See ex commands
- inserting files
, ,  - inserting text
, , , ,  - repeatedly
, 
- last-line mode
,  - line numbering
, ,  - mailx use of
,  - modes
, ,  - moving around in files
- See moving around in files
- moving lines
- ex command
,  - vi commands
, 
- multiple, simultaneous sessions
,  - multiple-file editing
,  - "No write since last change" message
,  - opening files
,  - opening lines
,  - overview
,  - paging
, ,  - printing files
, ,  - put command
, ,  - quitting
- and saving changes
,  - without saving changes
, 
- read-only version
,  - redrawing screen
,  - repeating commands
,  - saving changes
- and quitting
,  - without quitting
, 
- scrolling in
, ,  - searching and replacing
, , ,  - shell environment variable for
,  - starting
, ,  - status line
,  - substituting characters
,  - text entry
, ,  - troubleshooting unpredictable behavior
,  - undoing changes
, ,  - undoing undo
,  - yank command
, , 
- vi search command
, 
- view command
, , 
- viewing
- See display
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