home *** CD-ROM | disk | FTP | other *** search
- ;
- CMD.COM
-
- Size (recs) CRC Version Author/Latest Issue Disk
- CMD.COM 2k (12) B8EE 1.4 Bruce Morgen 4/91 Z3COM2
- CMD.3OM 2k (12) 4C79 1.4 Bruce Morgen 4/91 Z3COM2
- CMD.4OM 2k (16) C82C 1.4 Bruce Morgen 4/91 Z3COM2
-
- 1- Syntax 2- Notes 3- Examples of Use 4- CMDPATCH.Z80
-
- CMD is used to define and run a command line. It either accepts the
- command line (including semicolons) which follow the verb CMD into the command
- line buffer or, if no input is provided, it prompts the user for input and
- then places this into the command line buffer. Vs 1.0 (7/19/84) by R. Conn.
-
- The problem that CMD addresses is the case where the main program in a
- shell sequence knows nothing about shells, and it is desired to leave the
- sequence sometime. CMD provides this out. It was built specifically for use
- with the SHSET command, although it may find other applications.
- :1
-
- Syntax CMD cmd1&cmd2;... or CMD (prompted input)
-
- The sequence of commands "cmd1;cmd2;..." becomes the command line.
-
- Accepts the '&' substitute command separator and aborts the current shell,
- if any, if a Ctrl-C is entered in prompted mode.
- :2
- CMD Notes - 1/2
-
- a. CMD sets the ERROR message of ZCPR3, so that programs on down the line
- can determine if input was made when CMD was run. If the user simply
- strikes a RETURN in response to the CMD prompt, an error is indicated.
- Tests can later be made, like IF ERROR, to check this and make the
- command flow change depending on the outcome.
-
- b. Version 1.4 updates (3/23/91, Bruce Morgen):
- - Major change in prompted operation -- CMD now reinvokes itself after
- each command until an empty command line (a RETURN alone) or a
- Control-C is entered. Control-C also exits the current shell (if any)
- as in Version 1.3. In this way, CMD can act like an MS-DOS or UNIX
- "secondary shell" invocation for true Z-System shells as well as for
- "ZCPR2-style" shells like MEX with MEX2Z or Sage-modified WS4.
-
- c. Version 1.3 updates (8/16/88, Bruce Morgen):
- - Pre-release tweak to shell name printing code.
- CMD Notes - 2/2
-
- d. Version 1.2 updates (3/9/88, Bruce Morgen):
- - Now accepts the "&" substitute command separator and aborts the
- current shell, if any, if a control-C is entered in prompted mode.
- - Prompt shows current shell instead of silly "Noname" message.
- - Z33 type format with safety header, Z80 code with SYSLIB4 and DSEG.
- :3
- Examples of Use
-
- a. SHSET MU3;CMD <-- This will run MU3, allow the user to do what
- he wants, and then reenter MU3. 'SHCTRL POP'
- would pop the shell stack and break the
- 'MU3;CMD' loop.
- :4
- CMDPATCH.Z80
-
- Size (recs) CRC Version Author/Latest Issue Disk
- 1.0 Jay Sage 4/87 Z3UTIL10
- ==============================================================================
-
- CMDPATCH.Z80 is an overlay which patches two changes into version 1.0 of
- CMD. The first change makes it reset the shell bit in the message buffer
- command status flag so that the external or internal error handler will be
- invoked for bad commands. Before, the error was treated as a shell error,
- which resulted in the entire shell stack being cleared. The second change
- eliminates the extra space after the prompt character '>' in the command
- prompt. This extra space was confusing in cases where one wanted deliberately
- to enter a command with a leading space to force invocation of the ZCPR33
- extended command processor.
-
- CMDPATCH.Z80 should be assembled to a HEX file and overlaid on CMD.COM
- using the MLOAD command line: MLOAD CMDNEW=CMD.COM,CMDPATCH1.