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Annotation of 41BSD/cmd/apl/documents/apl.1, revision 1.1.1.1

1.1       root        1: .th APL I 7/10/78
                      2: .sh NAME
                      3: apl  \*-  The UCSF APL interpreter
                      4: .sh SYNOPSIS
                      5: .bd apl
                      6: .sh DESCRIPTION
                      7: The UCSF APL interpreter contains all the APL 360 operators
                      8: plus execute (epsilon), scan, and relational character operators.
                      9: The maximum workspace size is about 50,000 bytes.
                     10: .s3
                     11: Function definition is not what you would expect. Functions are
                     12: created and modified with the system editor. Type `)EDIT fname'
                     13: or `)EX fname' to creat or modify a function. Type `)READ
                     14: fname' if it exists and doesn't need editing.
                     15: .s3
                     16: The following I-beams are recognized by APL:
                     17: .in +.6i
                     18: .s3
                     19: 1iF            Open F for reading.
                     20: .s3
                     21: 2iF            Create F for writing.
                     22: .s3
                     23: 3iF            Append to F.
                     24: .s3
                     25: 1i0, 2i0, 3i0  Close the named channel.
                     26: .in
                     27: .s3
                     28: Only one read channel and
                     29: one write channel may be open simultaneously. When a file is open
                     30: for reading, references to the quad or quote-quad variable are
                     31: actually references to the named file. When open for writing,
                     32: assignments to the quad variable are written to the file.
                     33: .s3
                     34: .in +.6i
                     35: 10iC   Send command C to the shell.
                     36: .in
                     37: The command will be executed
                     38: as if it were typed at a UNIX terminal. This is equivalent to
                     39: the `!' feature of the editor.
                     40: .s3
                     41: Monadic I-beam functions are: 20 for the time of day, 21
                     42: to return CPU time used, 22 to return WS free in bytes,
                     43: 24 to return the starting time, 25 to return the date,
                     44: 28 to return the starting date, 29 to read the index
                     45: origin, 30 to read the terminal width, 31 to read the
                     46: printing precision (or `digits'), and 32 to
                     47: run the shell.
                     48: .sh BUGS
                     49: No trace function or state indicator.
                     50: .s3
                     51: No `)WSID' command. The existing system commands take
                     52: only one argument.
                     53: .s3
                     54: A `)WRITE fname' command is needed to get at functions which
                     55: exist only in workspaces.

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