MS-DOS Forum RSS Feed (Replies Included)

detecting hard disks?

Fri, 13 Nov 2009 02:17:46 -0700

How do i detect installed hard drives
on the computer?
Is there a bios call to do this?
Also how is this done from windiws api?
Thanks.

Re: DOS batch FOR with () files

Fri, 02 Oct 2009 07:48:52 -0700

For looping thru files, consider using the FILE-DIRECTORY-LOOP described at http://www.biterscripting.com/LearningScripting/Lesson4.html (Section: 4.1. FILE DIRECTORY LOOP ). You may be able to achieve more control that way.

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DOS batch FOR with () files

Fri, 11 Sep 2009 17:36:59 -0700

I am a computer dilettante burdened with VISTA64; please be gentle:

For /F "tokens=*" %%a IN ('"dir /-c "%filename%" | find "bytes" | find /v "free""') do @Set summaryout=%%a

This line sets up a summary that is further used to identify the file name. It works fine until it encounters a file name containing "()" which it will not recognize and responds with the disappointing statement, ".....was unexpected at this time," which is on a par with "Not tonight, hon." At the command prompt the DIR command does return the data for files containing brackets, but not in this command in the batch file. Any help or insight would be appreciated.

Re: unable to set variable in DOS batch file

Tue, 25 Aug 2009 06:50:30 -0700

I think I will have to provide more details to make things clear.

I am using IzPack Installer, which is used to package and install java applications on any target computer. Its just a software that helps on distribute custom java applications.

When using Izpack, Izpack has its own set of variables (or even user defined) which can be used in any file that is marked as parsable. At run time, these variables will be substituted with actual values by the Izpack parsing system. These variables are referred by syntax $VARIABLE ($ sign prefixing the variable name). Note that it has got nothing to do with the unix/linux variables

So in my case I have a DOS batch file (createDB.bat) marked as parsable,which contains $MYSQL_PATH as an Izpack variable. Now at run time, before the batch file is run, the Iapack variable substitution system, parses the $MYSQL_PATH variable and replaces it with actual value(for example "C:\temp"). I don't know what value is substituted when $MYSQL_PATH is empty.

I said earlier that things worked because, I didn't test it exhaustively. I had to decide what code to execute depending on whether $MYSQL_PATH is empty or has some value. I tested it for empty but not if it had some value. Thus I had a false impression that everything worked well.

Anyway you have helped me out to solve half the problem. Thanks a lot for that. I hope you have a fair idea of what I am trying to achieve

regards,
nirvan.

Re: unable to set variable in DOS batch file

Tue, 25 Aug 2009 02:41:05 -0700

There are two practical ways to pass variables to batch files, either by parameters(%1, %2) or by environment variables(%PATH%, etc.), which is what you seem to be doing. In linux scripts and several programming languages(Perl, PHP), variables are referred to with the $ prefix. In batch files(.bat), variables are referred to by double percent signs and the dollar sign has a completely different meaning.

What's confusing is you're saying it's a DOS batch file. I don't know if you're confusing it for a linux shell script or a windows batch script, but what I know is that there is no MySQL for DOS. You said using dollar signs around MYSQL_PATH fixed the first problem, so why does that suddenly not work now?

Re: unable to set variable in DOS batch file

Tue, 25 Aug 2009 01:59:22 -0700

I think you have got me wrong. I said in my first post that $MYSQL_PATH is an external variable (not belonging to dos). Before my dos batch file is executed this variable is parsed and replaced by some value. So when the dos batch file runs, $MYSQL_PATH either contains some value (for example "C:\Temp") or is null. I am not sure what it contains when its null. So I can't use %MYSQL_PATH% as you have pointed out because its not a dos variable. I think I will have to find out what it is when it is null.

regards,
nirvan.

Re: unable to set variable in DOS batch file

Mon, 24 Aug 2009 02:24:24 -0700

There a few different ways to do this:

if defined MYSQL_PATH goto isdefined

or:
set MPATH=%MYSQL_PATH%
if defined MPATH goto isdefined

or:
set MPATH=%MYSQL_PATH%
if not "%MPATH%"=="" goto isdefined

If MYSQL_PATH isn't defined, then "set MPATH=%MYSQL_PATH%" is equivalent to "set MPATH=", which undefines MPATH.

One other thing. Although the principles are the same, a Windows command prompt is not a DOS command prompt.

Re: unable to set variable in DOS batch file

Sun, 23 Aug 2009 21:39:54 -0700

Thanks for the reply. That solved my problem. But another problem popped up. Its possible that $MYSQL_PATH won't be defined. So I have to check whether MPATH is empty (null) or not. How do I do that in dos.

regards,
nirvan.

Re: unable to set variable in DOS batch file

Sun, 23 Aug 2009 21:38:39 -0700

Re: unable to set variable in DOS batch file

Sun, 23 Aug 2009 06:01:53 -0700

Use percent signs to refer to variables and don't put spaces next to the equal sign:
set MPATH=%MYSQL_PATH%

Then you can use echo "%MPATH%" or echo %MPATH% to print it.

unable to set variable in DOS batch file

Sat, 22 Aug 2009 15:11:51 -0700

I am trying to set a DOS variable like this.

set MPATH = "$MYSQL_PATH"

Here $MYSQL_PATH comes from a different context. The problem is that the variable MPATH never gets set. If I say echo "$MYSQL_PATH", then it properly prints the value contained in $MYSQL_PATH. But when I use echo "%MPATH%" nothing gets printed. Why am I not able to assign the value to MPATH when there is value in $MYSQL_PATH.

regards,
nirvan

Re: start /wait does not wait for process to finish

Fri, 21 Aug 2009 11:51:04 -0700

I know that in XP (not sure about vista) DOS does not support the wait function on 32-bit win apps, only on 16-bit, so you'll have to find a workaround. My suggestion would be to create a loop to see if any new files are created after running MySQL and use that as the trigger, or if running MySQL uses up specific ports you could use the net send command to see once they have finished using them. Hopefully you can think of a better method. Hope this helps, Dai.

------------------------------------------
Do or do not, there is no try. |
------------------------------------------

start /wait does not wait for process to finish

Fri, 21 Aug 2009 06:30:43 -0700

I am having a batch file which installs mysql and other addon's. I start the installation with start /wait command for MYSQL.exe as given below.

start /wait $INSTALL_PATH/Temp1/Server/MYSQL.exe
echo done

The problem is that the processing does not wait for the MYSQL.exe to complete. So in the above code the line "echo done" gets executed before the line "start /wait $INSTALL_PATH/Temp1/Server/MYSQL.exe" has finished installation of MYSQL.

regards,
nirvan.

save as from the command line

Wed, 19 Aug 2009 06:52:23 -0700

Is there a way to do the equivalent of Open/Save from the command line. I have an application that outputs csv files from SQL, but when I import them to another application they are not recognised. However if I open the file, and then click save (not Save AS) it is recognised. But I need to be able to automate the process.

Re: Help with Windows Command line FTP....

Mon, 17 Aug 2009 16:47:56 -0700

Thanks for the help. There were other issues with the "Windows Firewall" but when I simply turned off "Windows Firewall" it worked immediately so your suggestion was absolutely correct. Many thanks for the help!

change system date using DOS for a different machine

Wed, 12 Aug 2009 14:58:39 -0700

HI

Can i change the date of Machine 1 using DOS of Machine 2.
On both the machine the logged in user is the admnistrator
how can this be done???

Re: Help with Windows Command line FTP....

Tue, 11 Aug 2009 00:40:18 -0700

Hi.

Solution is quite simple. My server is in dutch so I don't know the exact translation of the steps.

Your windows firewall blocks the ftp program. Goto Windows firewall, change configuration.
Go to exceptions tab.
Check 'Display warnings'.
Choose apply.

When you launch the dos ftp you will get a warning message. Choose 'unblock' ftp.

Now everything works fine.

Greetz,

Mark Stulens

In mY mInd, I mUsT rEaD, vOrTeX

Wed, 29 Jul 2009 19:30:27 -0700

Hello newbies,
a house full of toxic waste...
Give me convenience or give me death!

A virus is a program file infector, it is either resident
(captures INT 21h vector) or non-resident (uses findfirst findnext).
To be able to construct a binary image which could tag itself
to the end of executables it must be coded in assembly,
for changing its offset in the binary image will change
the offsets of its variables.
There is a technique around this.

To get the difference to calculate
the offsets of your variables do this:
call mytrick
mytrick:
pop bp
sub bp,offset mytrick

Then to access your variables:
mov dx,[bp+offset var]

Simply encode a 3-byte near jmp instruction using as a displacement
the unsigned size of the host file in bytes.
Copy the first three bytes of the binary image (*.com) and replace it
with your jump at 100h and place the virii code at the end of the
host binary image.

More complex viruses can be created that interpret the .EXE file header.

Making your virus polymorphic:
Simple! Decrypt your encrypted code with a known key, execute,
generate a new key, store the new key in your programs data area,
re-encrypt the decrypted portion,write new encryption back where
the original encryption was stored,and overwrite your own programs
executable with the changes.
...

We hate mind-control,
we are words...

Batch File

Mon, 27 Jul 2009 02:29:24 -0700

Hi,
I m new to this..!

As per your suggestion to use the following code in a bat file to find the folder size:
@Echo On
@For /F "tokens=*" %%a IN ('"dir /s /-c | find "bytes" | find /v "free""') do @Set summaryout=%%a
@Echo %summaryout%
@For /f "tokens=1,2 delims=)" %%a in ("%summaryout%") do @set filesout=%%a&set sizeout=%%b
@Echo %filesout%
@Echo %sizeout%
@Set sizeout=%sizeout:bytes=%
@Echo %sizeout%
@Set sizeout=%sizeout: =%
@Echo Size is :%sizeout%
@Echo OFF
DIR /S

but when i m trying to execute this bat file i am unable to get the result i mean its so fast that i m unable to capture the data availale in it..!!
please help me..