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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
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-.TH APL 1 8/26/80
-.UC 4
-.SH NAME
-apl \- an apl interpreter
-.SH SYNOPSIS
-.B apl
-.SH DESCRIPTION
-.I Apl
-is an APL interpreter.
-All of the operators are exactly as in apl\e360.
-Overstrikes are often
-required, and they work (use ctrl-h).
-.PP
-Function definition is not what you would expect. Functions are loaded
-from files. The first line of the file is the function header, as you
-would expect it but with no del. The rest of the file is the lines
-of the function. Lines are numbered, but there are no
-square brackets with line numbers. If you say
-)READ FILE it will load the function
-in that file. If you say )EX FILE it will put you in the
-editor to change that file. Upon exit, it will read the file in
-as though by )READ.
-.PP
-All of the usual operators are available, including domino.
-Also available are monadic encode and epsilon.
-.LP
-The following
-.I apl
-system commands are available.
-.TP
-)ASCII
-.br
-changes terminal to accept and print ASCII characters and operators;
-this is the default.
-If you are stuck in APL mode on an ASCII terminal, `"' is `)' and
-lowercase letters map to uppercase.
-.TP
-)APL
-.br
-changes terminal to accept and print APL characters. Erase is set to
-\(*W and kill is set to \(*a.
-.TP
-)DIGITS n
-.br
-sets the number of digits displayed to n, from 1 to 19.
-.TP
-)FUZZ n
-.br
-sets the fuzz to n.
-.TP
-)ORIGIN n
-.br
-sets the origin to n, which should be 1 or 0.
-.TP
-)WIDTH n
-.br
-sets
-.IR apl \&'s
-idea of your terminal's carriage width.
-.TP
-)ERASE n
-.br
-gets rid of function or variable named n.
-.TP
-)SAVE n
-.br
-saves all variables and functions (workspace) in file named n.
-Workspaces are sensitive to changes in
-.I apl.
-.TP
-)LOAD n
-.br
-gets the workspace in file n (which must have been
-)SAVE'd.)
-.TP
-)COPY n
-.br
-like )LOAD but variables and functions are not erased. Things
-in the loaded file take precedence over stuff already in.
-.TP
-)CLEAR
-.br
-clears the workspace.
-.TP
-)DROP n
-.br
-deletes file n in your directory, which need not be saved from
-.I apl.
-.TP
-)CONTINUE
-.br
-exits and saves workspace in file
-.I continue
-which is loaded next time you run
-.I apl.
-.TP
-)OFF
-.br
-exits
-.I apl.
-.TP
-)READ n
-.br
-reads in a function from file \fIn\fR. The first line is the header,
-with no del's. The full APL\360 header is accepted. All other
-lines in the file are lines in the function. Lines are implicitly numbered,
-and transfers are as usual. There are no labels.
-.TP
-)EDIT n
-.br
-runs the editor
-.IR ed (1)
-on file \fIn\fR, and then )READ's the file when you leave the editor.
-.TP
-)EX n
-.br
-runs the editor
-.IR ex (1)
-on file \fIn\fR, and then )READ's the file when
-you leave the editor.
-.TP
-)VI n
-.br
-runs the editor
-.IR vi (1)
-on file \fIn\fR, and then )READ's the file when
-you leave the editor.
-.TP
-)LIB
-.br
-lists out all of the files in the current directory.
-.TP
-)FNS
-.br
-lists out all current functions.
-.TP
-)VARS
-.br
-lists out all current variables.
-.TP
-)DEBUG
-.br
-toggles a debugging switch, which can produce vast amounts
-of hopelessly cryptic output.
-.SH FILES
-apl_ws \- temporary workspace file
-.br
-continue \- continue workspace
-.SH AUTHORS
-Ken Thompson, Ross Harvey, Douglas Lanam
-.SH BUGS
-This program has not been extensively used or tested.
-.bp
-.SH ASCII CHAR MNEMONICS
-.nf
-.ta 0.5i 1.0i 3.0i 3.5i 4.0i
-
- & \(*L and # \(mu times
- \- \- minus + \(pl add
- < < less than > > greater than
- = = equal to , , comma
- % \(di divide * * exponential (power)
- ! ! factorial and combinations ? ? deal
- .le \(<= less than or equal .ge \(>= greater than or equal
- .ne \(!= not equal .om \(*W omega (not used)
- .ep \(*e epsilon .rh \(*r shape (rho)
- .nt \(no not (also \'~\') .tk \(ua take (also \'^\')
- .dr \(da drop .it \(*i iota
- .ci \(ci circular function .al \(*a alpha (not used)
- .cl \(lc maximum (ceiling) .fl \(lf minimum (floor)
- .dl \(*D del (not used) .de \(gr upside down del
- .jt \(de small circle (null) .qd \(sq quad
- .ss \(sb right U (not used) .sc \(sp left U (not used)
- .si \(ca Down U .su \(cu U (not used)
- .[^ \(gr upside-down del .bv \o'\(lf\(rf' decode (base)
- .rp \o'\(lc\(rc' encode (rep) .br \(or residue (mod)
- .sp \(<- assignment (also '_') .go \(-> goto
- .or V or .nn \o'\(*L~' nand
- .nr \o'v~' nor .lg \o'*\(ci' log
- .rv \o'\(ci\(or' reversal .tr \o'\(ci\e' transpose
- .rb reverse bar .cb \o',-' comma bar ( not used)
- .sb \o'/-' slash bar .bb \o'\e-' blackslash bar
- .gu \o'\(*D\(or' grade up .gd \o'\(gr\(or' grade down
- .qq \o'\(sq\(fm' quote quad .dm \o'\(sq:' domino
- .lm \o'\(ca\(de' lamp .ib \o'\(rc\(lc\(lf\(rf' I-beam
- .ex execute (not used) .fr format(not used)
- .di diamond (not used) .ot out (not used)
- .ld \o'\(*D~' locked del (not used) ._a A alias for \'A\'
- ._b B alias for \'B\' ._c C alias for \'C\'
- ._d D alias for \'D\' ._e E alias for \'E\'
- ._f F alias for \'F\' ._g G alias for \'G\'
- ._h H alias for \'H\' ._i I alias for \'I\'
- ._j J alias for \'J\' ._k K alias for \'K\'
- ._l L alias for \'L\' ._m M alias for \'M\'
- ._n N alias for \'N\' ._o O alias for \'O\'
- ._p P alias for \'P\' ._q Q alias for \'Q\'
- ._r R alias for \'R\' ._s S alias for \'S\'
- ._t T alias for \'T\' ._u U alias for \'U\'
- ._v V alias for \'V\' ._w W alias for \'W\'
- ._x X alias for \'X\' ._y Y alias for \'Y\'
- ._z Z alias for \'Z\'
-.fi