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Environment variables, set and input

Discussion in 'Support' started by Eric Pement, Oct 23, 2008.

  1. Eric Pement

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    I have a question about set. The docs for set says that "If you do not specify a filename and input is redirected, SET /R will read from stdin." But how does one redirect input without specifying a filename? The only way I know to do that is with a pipe. But this fails, as this demo shows.

    [ C:\eric_p\bat ]
    [0]>ver

    TCC 9.02.152 Windows XP [Version 5.1.2600]

    [ C:\eric_p\bat ]
    [0]>type xyz.btm
    @echo off
    echo Demonstration script
    echo 0 input params: %*
    echo.
    echo 1 piped to set
    echo VAR1=PIPED %* | set /r
    echo Value of var1 is (%var1)
    echo.
    echo 2 redirected to set
    echo VAR2=REDIRECT %* > file && set /r < file
    echo Value of var2 is (%var2)
    del /q file

    [ C:\eric_p\bat ]
    [0]>xyz aa :bb: c=d -e-f-g
    Demonstration script
    0 input params: aa :bb: c=d -e-f-g

    1 piped to set
    Value of var1 is ()

    2 redirected to set
    Value of var2 is (REDIRECT aa :bb: c=d -e-f-g)

    Any comments? It does appear as if set ought to accepted piped input, but that it does not. (That is, unless I have an old version of TCC that has a bug here.)

    Eric
     
  2. Charles Dye

    Charles Dye Super Moderator
    Staff Member

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    If I'm not mistaken, piping to SET /R will set the variables ... in the right-hand shell, which exits when it reaches the end of the piped data. It "works", but does nothing useful.

    The help file is referring to the SET /R < FILENAME syntax. I don't see that it offers anything that SET /R FILENAME doesn't, though.
     
  3. vefatica

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    On Thu, 23 Oct 2008 18:55:34 -0500, "JP Software Forums" <neil@jpsoft.com>,Eric
    Pement <> wrote:


    I think the help means a simple:

    SET /R

    That will read from the console.
     

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