Simtel MSDOS 1992 September/Simtel20_Sept92.cdr/msdos/info/dostips4.arc/DOSBATCH.TXT

Text File | 1986-06-28 | 29KB | 581 lines

                           Batch Logs
     (PC Magazine Vol 5 No 1 January 14, 1985 User-to-User)

     In developing a large software project you're likely to end up
writing a complex batch file to handle all the compiles, assemblies
and links required.  Sitting around for hours monitoring the batch
file to make sure everything works properly isn't fun.  It would be
handy if all the output from a batch file could be redirected to a
file to be inspected later.  Unfortunately, you can't do it simply
by redirecting the output of the master batch file: build.bat>logfile.
     However, there is an obscure way to do the same thing.  First,
make the very last line of your batch file the DOS command EXIT.  But
before running this batch file, load another copy of COMMAND.COM and
redirect its output to the log file:  command>logfile.
     With this trick, all screen output is redirected to your log file.
However, since the DOS prompt disappears and your typing will no longer
echo on the screen, be sure to type the name of your batch file
carefully, since you can't see it.  All the output of the batch file
will now to into your log file and the EXIT command at the bottom of
the batch file will return everything to normal.
     Editor's Note: This technique demonstrates yet another benefit of
loading COMMAND.COM as a secondary command processor.  An even more
interesting one is during a session with a windowing program that
doesn't normally give you access to DOS commands.  It's fairly simple
to record a batch session without loading in a second COMMAND.COM;
just toggle your printer echo on with Ctrl-PrtSc or Ctrl-P and
everything that appears on the screen will also be printed.  When
you're done, toggle it off the same way.

-----------------------------------------------------------------
                          Better Pauser
     (PC Magazine Vol 5 No 1 January 14, 1986 User-to-User)

     The DOS PAUSE command in a batch file will have the computer stop
and wait for a key.  STOP.COM replaces the PAUSE command and gets rid
of the "Strike a key when ready . . ." message.  You can instruct
STOP.COM to proceed when any key is pressed, or wait for a specific
key (extended codes are allowed).  Create STOP.COM with STOP.BAS
below.  STOP.COM will be either 11 or 19 bytes long depending on your
choice of trigger keys.

100 'STOP.BAS
110 DIM D(19):FOR Y=1 TO 11:READ D(Y):NEXT:DEF SEG=&H40
120 PRINT "Type specific key OR '?' for any key ";
130 LY$=INKEY$:IF LY$="" GOTO 130
140 TL=PEEK(26):TL=TL-2:IF TL<30 THEN TL=60
150 C1=PEEK(TL):C2=PEEK(TL+1)
160 IF C1<>0 THEN 190
170 SI=19:FOR Y=10 TO 19:READ D(Y):NEXT
180 D(15)=C2:D(6)=60:D(7)=0:GOTO 200
190 SI=11:IF C1<>63 THEN D(6)=60:D(7)=C1
200 OPEN "STOP.COM" AS #1 LEN=1
210 FIELD 1,1 AS PH$
220 FOR Y=1 TO SI:LSET PH$=CHR$(D(Y)):PUT #1:NEXT
230 PRINT:PRINT "STOP.COM created.":CLOSE #1:END
240 DATA 184,8,12,205,33,56,192,117,247,205
250 DATA 32,180,8,205,33,60,0,117,239,205,32

     The following is an assembler code version that will proceed only
when the F1 key is pressed.

xxxx:0100  B8080C   MOV   AX,0C08
xxxx:0103  CD21     INT   21
xxxx:0105  3C00     CMP   AL,00
xxxx:0107  75F7     JNZ   0100
xxxx:0109  B408     MOV   AH,08
xxxx:010B  CD21     INT   21
xxxx:010D  3C3B     CMP   AL,3B
xxxx:010F  75EF     JNZ   0100
xxxx:0111  CD20     INT   20

     Use DOS 2.0 or later DEBUG by first typing in DEBUG STOP.COM,
then typing A, then the rightmost two columns above.  Finish it off
by hitting the Enter key twic, then typing RCX, then 13, then W, then
Q, hitting the Enter key after each.  The 3B in the CMP AL,3B line is
the extended scan code for F1; to use F2 as the trigger, replace the
3B with 3C, etc.
     Editor's Note:  By creating STOP.COM and inserting the word STOP
in a batch file, you do halt the operation of the batch file without
the conventional PAUSE message.  However, you have to tell the user to
hit a key, presumably with an ECHO subcommand, so you're really not
gaining much, and you have to precede the STOP line with an ECHO OFF,
or you'll see the word STOP on-screen.  In addition, the PAUSE works
so well that if the "Strike . . ." message is really a bother, just
change it.  Use DEBUG with a copy of COMMAND.COM.  At the DEBUG
prompt, type RCX and hit the Enter key twice to see how long your
version of COMMAND.COM is.  Then enter the following DEBUG search
instruction:  S 100 XXXX "Strike a key" (replacing the XXXX with the
length reported when you typed RCX).  The last four digits of the new
number DEBUG reports are the address of the "Strike . . ." message --
for DOS 3.1 the address would be 491E.  You can use the DEBUG E command
to replace it with something the same length, such as "Hit any key to
continue" or you can blank it out if you want by entering 23 spaces
between a pair of quotation marks.  If the new message is shorter than
the old, pad out the difference with spaces.


-----------------------------------------------------------------

                     Interactive Batch Files
              (PC World January 1986 Star-Dot-Star)

     DOS batch file commands don't support one very useful feature --
user interaction.  The program QUERY.COM, when executed, displays a
message and waits for a single-keystroke reply.  A batch file can then
test ERRORLEVEL to determine the user's selection.
     To use the program, type QUERY followed by the text you want
displayed as a prompt, then an "at" sign (@) followed by the valid
response characters.  QUERY will set the ERRORLEVEL value to correspond
to the sequence of the characters listed.
     For example, when the lines shown in USERTEST.BAT execute, the PC
will display the message "Do you want to see a list of files?" and wait
for you to press Y or N (upper- or lowercase); all other keystrokes are
ignored.  If you press Y, ERRORLEVEL will be set to 1.  If you type N,
ERRORLEVEL will be set to 2.  Note that because DOS performs an "equal
to or greater than" test for ERRORLEVEL, you must test the highest
values first.
     If no @ character is found, QUERY will simply display the message.
If a question mark is included at the end of the response list, QUERY
will match any character.  Don't put a space at the end of the list
unless you want the <Space> bar to be considered a valid response.

USERTEST.BAT:
echo off
cls
query Do you want to see a list of files? @yn
if errorlevel 2 goto no
if errorlevel 1 goto yes
:no            don't show list of files
goto end
:yes           do show list of files
dir
goto end
:end

-----------------------------------------------------------------
                       Batch Line Skipper
       (PC Magazine Vol 5 No 3 Feb 11, 1986 User-to-User)

     The DOS 3.1 COMMAND.COM patch to skip a line in a batch file with
the ECHO + space + space construction (User-to-User, Vol 4 No 24) is
useful only when running a batch file on a system that has the patched
COMMAND.COM.  Anyone else who distributes batch files needs a way to
skip lines in batch files on all systems.  With ECHO OFF, the
construction ECHO ^H (^H means hold down the Ctrl key and hit the H
key) will skip a line using both DOS 2.1 and 3.1.  To demonstrate this,
create a batch file called LINE.BAT with these lines:

ECHO OFF
ECHO This is line 1.
ECHO ^H
ECHO This is line 3.

To insert the Ctrl-H you will need an editor or word processor that is
able to embed control characters.  This can be done with WordStar by
holding down the Ctrl key and typing PH.  Using EDLIN this can be done
by holding down the Ctrl key and typing VH.
     Editor's Note: The extended ASCII character set offers three
blanks -- CHR$(0), CHR$(32) and CHR$(255). CHR$(32) is the conventional
between-word space, while CHR$(0) is a null and CHR$(255) is a high-bit
space.  Following ECHO with either a CHR$(0) or a CHR$(255) will skip a
line.  Two other ways to create these line skippers are in BASIC and in
DEBUG.  WordStar lets you make the ECHO + CHR$(255) (but not CHR$(0))
by holding down the Alt key, typing 255 on the number pad (not the top
row), and then releasing the Alt key -- if you do this, a ^ appears.
If you use DEBUG, type in the whole file using your word processor (or
even the DOS COPY CON: facility) but put a single dummy character where
the CHR$(0) or CHR$(255) goes.  Then get into DEBUG and replace the
dummy character with either a 0 for CHR$(0) or an FF for CHR$(255), or
just follow ECHO with a period -- and no intervening space.


-----------------------------------------------------------------
                          REMless REMs
       (PC Magazine Vol 5 No 3 Feb 11, 1986 User-to-User)

     Well-chosen remarks within a batch file can be very valuable in
prompting a user to swap disks or to display a title or logo.  However,
it would be nice to eliminate the actual word REM from the display.
The trick is to place a string of backspaces (CHR$(8)) at the beginning
of the remark line.  You can't do this when using the DOS COPY CON:
batch creation method, since DOS uses the Backspace key for making
corrections.  But any word processor that allows embedded control codes
makes it easy.
     In the following REMLESS.BAT example, the first remark will be
preceded by a REM, while the second won't.  (Each backspace here
appears as a lowercase h.)

CLS
REM this is a remark
REMhhhthis is a REMless remark

You can also use this technique along with SideKick's ability to enter
and edit the upper 128 ASCII graphics symbols to create attractive
titles.
     Editor's Note:  This eliminates the problem of displaying REMs,
but it's just as easy to start batch files with ECHO OFF and then ECHO
comments.  If you have a word processor such as SideKick or WordStar
that lets you embed control characters, you can create each backspace
in REMLESS.BAT by typing Ctrl-PH (they'll show up as ^H's).  Otherwise,
run the REMLESS.BAS program below.

100 'REMLESS.BAS: Creates REMLESS.BAT test batchfile
110 OPEN "remless.bat" FOR OUTPUT AS #1
120 PRINT #1,"CLS"
130 PRINT #1,"REM this is a remark"
140 PRINT #1,"REM";STRING$(3,8);"this is a REMless remark"
150 CLOSE:END


-----------------------------------------------------------------

             Improved Return to a Previous Directory
             (PC World January 1986 The Help Screen)

     This technique provides a more elegant method to make a batch file
that changes directories switch back to the directory from which the
batch file was invoked.  It assumes that batch files are kept in a
directory called BATCH and that a PATH command that includes the BATCH
directory is executed by the hard disk's AUTOEXEC.BAT file.
     This routine relies on a 3-character ASCII file called CDSPACE.TXT
and three DOS commands that you can add to any batch file that changes
directories.  First create CDSPACE.TXT and store it in the hard disk's
BATCH directory with the following procedure.  At DOS, type COPY CON C:
\BATCH\CDSPACE.TXT and press Enter.  Then type CD and press the space
bar.  To write the file to disk, press F6 and Enter.
     After creating SAMPLE.BAT below, type PATH and press Enter to
verify that C:\BATCH is included in the list of directories that are
to be searched for the commands or batch files not in the current
directory.  (If it is not included, type PATH C:\BATCH and press
Enter.)  Make the root directory current by typing CD\ and press
Enter, and run the batch file by typing SAMPLE followed by Enter.
     The first line of SAMPLE.BAT copies the 3-character ASCII file
CDSPACE.TXT into a file called RESET_CD.BAT in the BATCH directory of
drive C:.  The ">NUL" at the end of this line redirects the screen
output of the copy command, "1 file(s) copied," to the NUL device
(the equivalent of "nothing") so that the copy message is not displayed
on the screen.  The double greater-than symbols in the second line
cause the CD (current directory) command's output (in this case,
C:\), which is normally displayed on screen, to be appended to the 3
characters of RESET_CD.BAT.  RESET_CD.BAT now consists of the command
CD followed by the name of the directory from which SAMPLE.BAT was
invoked.  These two lines, of course, must be executed before the
batch file changes directories.  SAMPLE.BAT then displays the current
directory (the directory from which it was invoked), changes
directories, and displays the name of the new current directory.  The
last line of SAMPLE.BAT calls RESET_CD.BAT, the file that was created
by SAMPLE.BAT's first two lines.  RESET_CD.BAT makes the directory
from which SAMPLE.BAT was called the current directory.

SAMPLE.BAT:
COPY C:\BATCH\CDSPACE.TXT C:\BATCH\RESET_CD.BAT > NUL
CD >> C:\BATCH\RESET_CD.BAT
REM  The lines that begin and end this sample batch
REM   file can be added to any batch file that changes
REM   directories so that the batch file can change
REM   back to the directory from which it was invoked.
CD
CD \BATCH
CD
RESET_CD

-----------------------------------------------------------------
                        Batch Refinements
       (PC Magazine Vol 5 No 6 Mar 25, 1986 User-to-User)

     You can speed up execution of batch files two ways.  First,
instead of using repeated ECHO statements to put long messages
on-screen, have the program instead TYPE the contents of several small
message files on the same disk.  This also lets you create attractive,
centered screens with borders, arrows, etc.  Second, instead of using
REMs to insert nonprinting comments, turn such comments into labels by
putting a colon at the beginning of the line.  These look neater than
REMs and will not print to the screen regardless of whether ECHO is
off or on.
                     All FOR DOS Redirection
              (PC World April 1986 The Help Screen)

     This article addresses execution of the DOS command FOR with a
utility that requires redirection fo standard input and output.
     Suppose the utility STRIP.COM is used to convert WordStar files
into ASCII files.  The command syntax is STRIP < infile > outfile
where infile is the name of the WordStar file to be converted, and
outfile is the name of the ASCII output file.  The command:
FOR %Z IN (*.*) DO command will execute whatever DOS command replaces
command for each of the file names listed between the parentheses.
In using the FOR command to execute STRIP repeatedly for each WordStar
file (none of which has a file name extension) to create ASCII files
with the same name plus the extension .ASC, the command:
FOR %Z IN (*.) DO STRIP < %Z > %Z.ASC  produces the "File not found"
error message.
     The solution:  When present in a DOS command, the redirection
symbol < enables the command to receive its input from the file (or
device) specified after the symbol instead of from the keyboard.
In such instances, DOS verifies that the specified file exists before
executing the command.  For example, try the command:  DIR < %Z.  %Z
is the name of the file that DOS could not find when you invoke the
FOR command.  Because the FOR command is not executed until DOS has
completed its search for the input file, %Z is not interpreted as a
DOS variable but rather as literal characters of a file name, i.e.,
the redirection symbols in:  FOR %Z IN (*.) DO STRIP < %Z > %Z.ASC
are part of the FOR command and not the STRIP command.  To solve the
problem, first create the STRIP.BAT batch file:

STRIP < %1 > %1.ASC

Substituting STRIP.BAT %Z in place of STRIP < %Z > %Z.ASC in the
original command works almost as intended, except that conversion
will work only on the first matching file before the DOS prompt
reappears.  This is because DOS doesn't permit a batch file to be
nested within a FOR command (or inside another batch file), so control
is not returned to the FOR command after the nested batch file has
been executed.  You can, however, nest a call for another command
processor.  When the second command processor has completed its
function, control is passed back to the initial command processor,
which then resumes its current task.  Having created STRIP.BAT,
therefore, you can type:  FOR %Z IN (*.) DO \ COMMAND /C STRIP.BAT %Z
and press Enter to convert the files.  Better yet, place that command
in a batch file, which you may want to call BULKSTRP.BAT.  And don't
forget that the variables of a FOR command in a batch file must be
preceded by double % signs.

-----------------------------------------------------------------
                     Batch of Documentation
               (PC World April 1986 Star-Dot-Star)

     As utility programs accumulate, there's an obvious need for some
means to keep track of their various features and commands.  You can
maintain the information you need in separate files, one for each
program.  Each program is named after the program it documents, but
contains the extension .DOC.  For retrieval use a batch file called
DOC.BAT that includes the following line:  TYPE %1.DOC | MORE.  The
MORE command prevents text longer than 24 lines from scrolling off
the screen but requires that the DOS filter program MORE.COM also be
on the disk; you may choose to omit the command and the pipe symbol
that precedes it.  Whenever you need information about a particular
utility, simply type DOC followed by the program's name.  For example,
type DOS WHEREIS to view on-line documentation for WHEREIS.COM.

-----------------------------------------------------------------
                        Best Batch Branch
       (PC Magazine Vol 5 No 8 Apr 29, 1986 User-to-User)

     Long batch files containing numerous "if ... goto" conditional
statements tend to slow down dramatically as processing moves further
along.  DOS searches slowly for each new label from the top of the
file, yielding a pathetic 5- to 10-second delay, even on an AT, if
the label occurs near the end of a long batch.  There is a way to get
rid of all the labels and "if errorlevel ... goto" statements, allowing
a batch file to work at top speed and still contain numerous
conditional branches.
     Most batches can be controlled with a simple Y(es) or other
single-key response to each request.  The GETKEY technique described
in an earlier User-to-User sets a different errorlevel for every
response.  Because DOS returns a "true" if errorlevel <= the set
value, batch files ordinarily require four "if errorlevel" tests to
obtain "true" on Y or y but "false" on other keys.
     GETYES.COM performs these tests, thereby removing them from the
batch.  It sets errorlevel 255 for Y or y and errorlevel 0 for any
other key.  This lets you directly perform an operation with the
statement "if errorlevel 255 (perform some DOS function)".  GETYES.COM
is created with GETYES.BAS below.
     You can next "if" conditionals on one line of a batch file for
further flexibility and control; for example, "if errorlevel 255 if
exist filename (perform some DOS function)" or "if errorlevel 255 if
x == %1 (perform some DOS function)".  This doesn't seem to be
documented in the DOS manual.

100 'GETYES.BAS
110 OPEN "GETYES.COM" AS #1 LEN=1
120 FIELD #1,1 AS D$
130 FOR B=1 TO 18
140 READ A$:LSET D$=CHR$(VAL("&H"+A$))
150 PUT #1:NEXT:CLOSE
160 DATA B4,00,CD,16,3C,59,74,04,3C
170 DATA 79,75,02,B0,FF,B4,4C,CD,21

     Editor's Note:  This technique makes batch branching a pleasure.
If you want to use N and n rather than Y and y to trigger errorlevel,
substitute 4E for 59 in line 160 and 6E for 79 in line 170, and change
the reference from GETYES.COM to GETNO.COM.  To test this after
creating the GETYES.COM program, use this TESTTHIS.BAT file:



echo off
:start
echo Hit y or Y or another key
getyes
if errorlevel 255 goto :yes
goto :no
:yet
echo ...you said yes
goto :continue
:no
echo ...you didn't hit y or Y
:continue
echo Now, want to quit (y/n)?
getyes
if errorlevel 255 goto :exit
goto :start
:exit

     The nesting abilities allow even more power.  To test these,
revise the fifth line of TESTTHIS.BAT to read:

if errorlevel 255 if Z==%1 goto :yes

Then, if you execute TESTTHIS.BAT again, hitting Y or y at the first
prompt will not result in a branch as it did earlier.  To make both
of the nested conditions true, instead of executing the batch file by
typing TESTTHIS, at the DOS prompt type:

TESTTHIS Z

and hit Y or y when asked.  The Z after the filename will replace the
%1 parameter, and since both conditions (the errorlevel and the Z==Z)
are true, the batch file will work as advertised.  If you try this, be
sure to type in a capital Z; DOS, which much of the time converts
lowercase keyboard inputs into uppercase ones, is case-sensitive here.

-----------------------------------------------------------------
                  Automating a DOS 3.1 Upgrade
         (PC Magazine Vol 5 No 10 May 27, 1986 PC Tutor)

     One of the differences between DOS 3.0 and 3.1 is the way the ECHO
command works.  With DOS 3.0, batch files can turn ECHO off and then
use the ECHO command to display instructions on the screen.  Using ECHO
followed by two spaces to create blank lines works with DOS 3.0 but
DOS 3.1 gives an "Echo is off" message on these lines.
     This obstacle can be overcome.  Converting batch files is an easy
job using the search-and-replace function in many text editors and word
processors.  This conversion is an excellent example of a job you can
handle rather elegantly using only normal DOS programs and facilities.
     The secret is getting ECHO to print a blank line is to use the
ASCII code 255 instead of a blank.  ASCII 255 shows up as a blank on
the PC screen, but to DOS, it's a nonblank, so you won't get the "Echo
is off" message.  You can create an ASCII 255 at your keyboard by
pressing the Alt key, typing 255 on the number pad, and then releasing
the Alt key.
     Some text editors and word processors can handle ASCII 255 and
some can't, but the job can be done easily with EDLIN.  EDLIN is tiny
and fast, and ideal for doing fix-up jobs on text files less than 64K
in length.
     If you edit the batch files in EDLIN, you can do a search and
replace to fix up the ECHO command with this EDLIN command:

1.RECHO <F6>ECHO {255}

     The first number means "start a line 1."  The missing second
number after the comma means to end at the last line in memory.  Next
is R for "replace," followed immediately by the old string (ECHO and
two blanks).  After the old string, press the F6 key (do not type the
< and > brackets).  It will appear on the display as a ^Z.  Then type
the new string: ECHO followed by a blank followed by the ASCII code
255.  The notation here means: press the Alt key, type 255 on the
number pad, then release the Alt key.  This, incidentally, will appear
as a blank on your display.  Since EDLIN's search and replace is case-
sensitive, you'll probably have to do it for lowercase "echo" commands
if you've also used these in your batch files.
     Since EDLIN gets keyboard input through DOS (unlike most word
processor and text editors), it can be used with redirection of
standard input.  Begin by creating a small file (with EDLIN, of course)
called REPLACE that looks like:

1.RECHO <F6>ECHO {255}
2.RECHO <F6>Echo {255}
3.RECHO <F6>echo {255}
E

     Don't type these lines as commands in EDLIN.  Instead, go into
EDLIN's Insert mode (with the I command), and type them as data into
the file.  These are keystrokes used below.  Note that three different
search-and-replace strings are included for the three possible ways
ECHO probably appears in your batch files.  The E command at the end
tells EDLIN to end and save.
     (If you ever have to edit REPLACE after you create it, use the /B
option with EDLIN.  Since F6 is the same as a Ctrl-Z, which normally
means "End of File," EDLIN will stop reading the file at the first
Ctrl-Z unless it has the /B flag.)
     Now to change a particular batch file, all you have to do is
enter the command:

EDLIN batfile.BAT < REPLACE

and DOS will get all the keystrokes from REPLACE to do the search and
replace for you.
     Let's go a step further.  Start by creating a one-line batch file
(called CHGBAT.BAT):

EDLIN %1 < REPLACE

Then create another one-line batch file called CHGALL.BAT:

FOR %%X IN (*.BAT) DO COMMAND /C CHGBAT %%X

     Now when you run CHGALL.BAT, it will execute CHGBAT.BAT for every
batch file on the disk (or subdirectory).  Each time CHGBAT runs, it
loads another batch file into EDLIN and uses REPLACE for the keystrokes
to do the search and replace.
     An interesting side-effect you'll encounter when you go through
this process is that some batch files will get edited twice.  The
reason is that EDLIN renames the old version of an edited file with
an extension .BAK.  It creates a new directory entry to save the new
version.  Thus, the FOR command in CHGALL.BAT comes across the file
again.  You'll also notice that CHGALL.BAT and CHGBAT.BAT will
themselves be edited by EDLIN during this process.  Neither of these
two peculiarities caused any problems under DOS 3.1, however.
     If you have batch files in a lot of different subdirectories on
your hard disk, you could use SWEEP.COM (PC Mag Vol 4 No 23) to run
CHGALL over all subdirectories on the hard disk with the command:

SWEEP CHGALL

     If you decide to do this, make sure to set your PATH command so
that DOS can find CHGALL and CHGBAT from different subdirectories.
Also modify CHGBAT.BAT to include the specific directory where REPLACE
may be found.

-----------------------------------------------------------------
                    Batch File Input Comment
               (PC World June 1986 Star-Dot-Star)

     DOS does not have a batch file facility to accept input from the
keyboard.  If you write batch files frequently, you may have been
frustrated because then can't prompt the user to supply text that can
be used as parameters for another operation.
     One solution is KEYLINE.COM, which accepts a line of input from
the keyboard and stores it in a specified file.  With I/O redirection,
that file can supply the equivalent of typed input for another program;
if the specified file name ends with .BAT, .COM, or .EXE, it can be run
without modification.
     To use KEYLINE.COM, type:  KEYLINE filename <Enter>.  (Be sure to
type only one space between the command KEYLINE and the name of the
file that is to store the user's input.)  Filename may include a DOS
path, but be careful.  Although KEYLINE.COM will create the specified
file when it does not exist, the program will erase the current
contents of an existing specified file before it accepts and stores
the user's response.
     If for any reason the file cannot be created, KEYLINE.COM will
set the batch ERRORLEVEL to 1 and exit, so you may wish to rest for
that value immediately after executing KEYLINE.COM.  The batch file
MENU.BAT demonstrates one way to use KEYLINE.COM.

1 'KEYLINE.BAS:  RUN to create KEYLINE.COM
10 DEFINT A-Z:CLS:KEY OFF:DEF FNHEX(X$)=VAL("&h"+X$)
20 READ F$
30 LOCATE 5,1,1:PRINT "Checking DATA ....";
40 SUM-0:READ LN:IF LN<0 THEN 80
50 READ H$:IF VAL(H$)<0 THEN 70
60 SUM=(SUM+FNHEX(H$))*2:SUM=(SUM\256)+(SUM MOD 256):GOTO 50
70 READ CKSUM$:IF SUM=FNHEX(CKSUM$) THEN 40 ELSE GOTO 170
80 RESTORE:CLS:READ F$
90 LOCATE 5,1,1:PRINT "Press any key except ESC to create ";F$;": ";
100 A$=INPUT$(1):PRINT:IF A$=CHR$(27) THEN END
110 LOCATE 6,1:PRINT "Working ...";
120 OPEN F$ AS #1 LEN=1:FIELD #1,1 AS BX$
130 READ LN:IF LN<0 THEN 160
140 READ H$:IF VAL(H$)<0 THEN READ CKSUM$:GOTO 130
150 LSET BX$=CHR$(FNHEX(H$)):PUT #1:GOTO 140
160 CLOSE:PRINT:PRINT F$;" has been created.":END
170 PRINT:PRINT "Error in DATA line";STR$(LN);" :"
180 PRINT "Check DATA statements.":BEEP:END
1000 DATA "a:keyline.com"
1010 DATA 1,be,80,00,31,db,8a,1c,46,c6,00,00,46,89,f2,b9,20,-1,1b
1020 DATA 2,00,b4,3c,cd,21,72,32,89,c1,be,4f,01,c6,04,80,89,-1,5b
1030 DATA 3,f2,b8,0a,0c,cd,21,46,31,db,8a,1c,80,c3,02,c7,00,-1,58
1040 DATA 4,0a,1a,fe,c3,87,cb,46,89,f2,b4,40,cd,21,72,0a,b4,-1,a0
1050 DATA 5,3e,cd,21,72,04,b0,00,eb,02,b0,01,b4,4c,cd,21,-1,21,-1

MENU.BAT:

echo off
cls
echo Enter the command you wish to perform:
keyline cmd.bat
echo pause >> cmd.bat
echo %0 >> cmd.bat
cmd