132 lines
3.7 KiB
Groff
132 lines
3.7 KiB
Groff
.TH VT220 1
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.UC 4
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.SH NAME
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vt220 \- define SHIFTED function keys on VT220 terminal
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.SH SYNTAX
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.B vt220
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[
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.B \-cil
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]
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[ keyname keystring ] ...
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.SH DESCRIPTION
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.I Vt220
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sets up a "vt220 terminal" in vt200 mode to allow user
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definition of the SHIFTED function keys. Each
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\f2keyname\f1 specified on the command line will be loaded with
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the corresponding \f2keystring\f1.
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A \f2keyname\f1 is one of the following "words":
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F6 F7 F8 F9 F10 F11 ESC F12 BS F13 LF F14 HELP DO F17 F18 F19 F20.
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\f2Keystrings\f1
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must be quoted if spaces, tabs, or shell metacharacters are included.
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.PP
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.B Vt220
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expects to receive some combination of option flags and/or
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argument pair(s), otherwised an usage message
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is printed.
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.PP
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The options are:
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.TP
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.B \-c
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Clears all SHIFTED function key definitions before setting them to user
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defined strings.
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.TP
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.B \-i
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Read the initialization file
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.I $HOME/.vt220rc
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for SHIFTED function key definitions. This is done before any
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argument pair specified on the command line is processed.
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Each line in the file must consist of two fields (separated by spaces
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or tabs) where the first field is the
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\f2keyname\f1 and the second field is the \f2keystring\f1.
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The second field extends to the end of the line, thus a
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\f2keystring\f1
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may include spaces or tabs. A newline (return) may be specified
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within the string by using the C Language notation for newline (\\n).
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.TP
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.B \-l
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Locks the function keys from further definition.
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Locking occurs after processing the initialization file (if the "i"
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option is specified) and any argument
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pairs.
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The only way
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to unlock is by turning the power off.
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.SH EXAMPLES
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vt220 -ci
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.br
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vt220 F6 'nroff -ms '
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.br
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vt220 -i F20 'cc -O -c '
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.br
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vt220 -l HELP man
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.SH "OTHER FEATURES"
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Pressing the function keys without using the shift key, generates
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a string of characters. With
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\f2csh\f1(1) this string can be aliased to some command. For example:
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.br
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alias ^[[17~ "ls -CR | more"
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.br
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where ^[[17~ is what is generated by pressing the F6 key. Therefore
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F6 can perform two commands, depending if pressed with/without the SHIFT
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key.
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.PP
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.B Vt220
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can be called from your .login or .profile file. Typically an user
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will create a initialization file and include a line like
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.br
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vt220 -ci
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.br
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OR
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.br
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vt220 -cil
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.br
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in the above mentioned files. This way the SHIFTED function keys
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will be set to your favorite commands when logging in.
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.SH CAVEATS
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If the SHIFTED function keys are unlocked, redefinition of a SHIFTED
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function key will rewrite the old string.
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.PP
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There are 256 bytes available for the SHIFTED function keys. Space is
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supplied on a first-come/first-serve basis. After the 256 bytes are
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used, you can't define any more keys unless space is cleared. This
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can be done by redefining a key to contain a string of fewer bytes.
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.PP
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All key definitions are stored in volatile RAM, and are lost when
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terminal power is lost.
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.PP
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The ESC key (unshifted) no longer generates the proper escape character. This
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is of particular importance since many editors require use of the
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ESC key. Here are some available alternatives:
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.sp
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.in +.5i
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The escape character can be generated by typing ^[ (control-[).
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.sp
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Use
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.B vt220
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as follows (note ^[ is control-[)
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.br
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.in +.5i
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vt220 ESC '^['
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.in
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.br
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This will require you
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to press the SHIFT key and ESC to generate the escape sequence.
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.sp
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Some editors, allow other character(s) to be substituted for the
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escape character. For example with
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.B emacs
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include this line in your .emacs_pro:
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.br
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(bind-to-key "ESC-prefix" "\\033[23~")
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.br
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Thus when the ESC key is pressed, emacs will allow the characters
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generated (^[[23~) to perform the same function as the escape
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character.
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.in
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.SH FILES
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$HOME/.vt220rc \- initialization file
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.SH "SEE ALSO"
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VT220 Programmer Reference Manual
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.br
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VT220 Programmer Pocket Guide
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