176 lines
3.9 KiB
Groff
176 lines
3.9 KiB
Groff
.\" $FreeBSD$
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.\"
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.Dd January 16, 2001
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.Dt VT220KEYS 1
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.Os
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.Sh NAME
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.Nm vt220keys
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.Nd "define SHIFTED function keys on VT220 terminal"
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.Sh SYNOPSIS
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.Nm
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.Op Fl cil
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.Op Ar keyname keystring ...
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.Sh DESCRIPTION
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The
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.Nm
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utility sets up a
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.Dq "vt220 terminal"
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in vt200 mode to allow user
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definition of the SHIFTED function keys.
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Each
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.Ar keyname
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specified on the command line will be loaded with
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the corresponding
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.Ar keystring .
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A
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.Ar keyname
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is one of the following words:
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.Cm F6 F7 F8 F9 F10 F11 ESC
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.Cm F12 BS F13 LF F14 HELP
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.Cm DO F17 F18 F19 F20 .
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.Ar Keystrings
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must be quoted if spaces, tabs, or shell metacharacters are included.
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.Pp
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The
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.Nm
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utility expects to receive some combination of option flags and/or
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argument pair(s), otherwise a usage message
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is printed.
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.Pp
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The options are:
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.Bl -tag -width indent
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.It Fl 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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.It Fl i
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Read the initialization file
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.Pa $HOME/.vt220rc
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for SHIFTED function key definitions.
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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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.Ar keyname
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and the second field is the
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.Ar keystring .
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The second field extends to the end of the line, thus a
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.Ar keystring
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may include spaces or tabs.
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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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.It Fl 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
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.Fl 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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.El
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.Sh EXAMPLES
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.Bd -literal
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vt220keys -ci
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vt220keys F6 'nroff -ms '
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vt220keys -i F20 'cc -O -c '
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vt220keys -l HELP man
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.Ed
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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.
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With
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.Xr csh 1
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this string can be aliased to some command.
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For example:
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.Pp
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.Dl alias\ ^[[17~\ "ls\ -CR\ |\ more"
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.Pp
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where
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.Ql "^[[17~"
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is what is generated by pressing the F6 key.
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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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The
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.Nm
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utility can be called from your
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.Pa .login
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or
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.Pa .profile
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file.
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Typically an user
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will create an initialization file and include a line like
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.Pp
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.Dl "vt220keys -ci"
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OR
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.Dl "vt220keys -cil"
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.Pp
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in the above mentioned files.
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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.
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Space is
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supplied on a first\-come/first\-serve basis.
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After the 256 bytes are
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used, you can't define any more keys unless space is cleared.
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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.
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This
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is of particular importance since many editors require use of the
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ESC key.
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Here are some available alternatives:
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.Bl -bullet
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.It
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The escape character can be generated by typing
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.Ql ^[
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(control\-[).
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.It
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Use
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.Nm
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as follows (note
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.Ql ^[
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is control\-[)
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.Pp
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.Dl "vt220keys ESC '^['"
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.Pp
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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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.It
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Some editors, allow other character(s) to be substituted for the
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escape character.
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For example with
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.Xr emacs 1
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include this line in your
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.Pa .emacs_pro :
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.Pp
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.Dl (bind-to-key\ "ESC-prefix"\ "\\033[23~")
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.Pp
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Thus when the ESC key is pressed,
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.Nm emacs
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will allow the characters generated
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.Pq Li ^[[23~
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to perform the same function as the escape
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character.
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.El
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.Sh FILES
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.Bl -tag -width $HOME/.vt220rc
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.It Pa $HOME/.vt220rc
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initialization file
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.El
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.Sh SEE ALSO
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.Rs
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.%B "VT220 Programmer Reference Manual"
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.Re
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.Rs
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.%B "VT220 Programmer Pocket Guide"
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.Re
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