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Message-ID: <001901c11d43$aa03bab0$0a02a8c0@acceleron>
From: "Andrew Cottrell" <acottrel AT ihug DOT com DOT au>
To: <djgpp-workers AT delorie DOT com>, "Peter J. Farley III" <pjfarley AT dorsai DOT org>
Cc: <snowball3 AT bigfoot DOT com>, "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>,
        <sandmann AT clio DOT rice DOT edu>
References: <00cb01c11ccc$ef2fadf0$0a02a8c0 AT acceleron> <00cb01c11ccc$ef2fadf0$0a02a8c0 AT acceleron> <5 DOT 1 DOT 0 DOT 14 DOT 0 DOT 20010804111223 DOT 02918ec0 AT pop DOT dorsai DOT org>
Subject: Re: Bash 2.05 buffer overrun problem
Date: Sun, 5 Aug 2001 10:14:57 +1000
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Reply-To: djgpp-workers AT delorie DOT com

> PMFJI here, but on my Win98SE system, this is the response I get from
> entering "command /?" on a DOS box (word-wrapped lines were adjusted
> manually, sorry if it still wraps when you see it):
>
> Microsoft(R) Windows 98
>     (C)Copyright Microsoft Corp 1981-1999.
>
> C:\>command /?
> Starts a new copy of the Windows Command Interpreter.
>
> COMMAND [[drive:]path] [device] [/E:nnnnn] [/L:nnnn] [/U:nnn] [/P]
>          [/MSG] [/LOW] [/Y [/[C|K] command]]
>    [drive:]path Specifies the directory containing COMMAND.COM.
>    device       Specifies the device to use for command input and output.
>    /E:nnnnn     Sets the initial environment size to nnnnn bytes.
>                 (nnnnn should be between 256 and 32,768).
>    /L:nnnn      Specifies internal buffers length (requires /P as well).
>                 (nnnn should be between 128 and 1,024).
>    /U:nnn       Specifies the input buffer length (requires /P as well).
>                 (nnn should be between 128 and 255).
>    /P           Makes the new Command Interpreter permanent (can't  exit).
>    /MSG      Stores all error messages in memory (requires /P as well).
>    /LOW         Forces COMMAND to keep its resident data in low memory.
>    /Y           Steps through the batch program specified by /C or /K.
>    /C command   Executes the specified command and returns.
>    /K command   Executes the specified command and continues running.
>
> Note that the ENVIRONMENT size (/E:) is allowed to be up to 32768.  I
> think that is the size you need to allow for.  Though personally I've
> never used more than 1024, there's no telling what someone else might
> choose to use.
>
> What does "command /?" report on W2K?
>
Win2K command & cmd output
C:\>command /?
Starts a new instance of the MS-DOS command interpreter.

COMMAND [[drive:]path] [device] [/E:nnnnn] [/P] [/C string] [/MSG]

  [drive:]path    Specifies the directory containing COMMAND.COM file.
  device          Specifies the device to use for command input and output.
  /E:nnnnn        Sets the initial environment size to nnnnn bytes.
  /P              Makes the new command interpreter permanent (can't exit).
  /C string       Carries out the command specified by string, and then
stops.
  /MSG            Specifies that all error messages be stored in memory. You
                  need to specify /P with this switch.

C:\>
C:\>cmd /?
Starts a new instance of the Windows 2000 command interpreter

CMD [/A | /U] [/Q] [/D] [/E:ON | /E:OFF] [/F:ON | /F:OFF] [/V:ON | /V:OFF]
    [[/S] [/C | /K] string]

/C      Carries out the command specified by string and then terminates
/K      Carries out the command specified by string but remains
/S      Modifies the treatment of string after /C or /K (see below)
/Q      Turns echo off
/D      Disable execution of AutoRun commands from registry (see below)
/A      Causes the output of internal commands to a pipe or file to be ANSI
/U      Causes the output of internal commands to a pipe or file to be
        Unicode
/T:fg   Sets the foreground/background colors (see COLOR /? for more info)
/E:ON   Enable command extensions (see below)
/E:OFF  Disable command extensions (see below)
/F:ON   Enable file and directory name completion characters (see below)
/F:OFF  Disable file and directory name completion characters (see below)
/V:ON   Enable delayed environment variable expansion using c as the
        delimiter. For example, /V:ON would allow !var! to expand the
        variable var at execution time.  The var syntax expands variables
        at input time, which is quite a different thing when inside of a FOR
        loop.
/V:OFF  Disable delayed environment expansion.