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I have following .Net(C#) code finally. Hope someone could make benefit from it. Actually my purpose is to understand how handles are written without experimenting with chained redirections but writing to them directly from a command/application. - Instead of Process Explorer handle from SysInternal...

I tried to write handle 3 with following. There is no way to write directly to handle 3 so i create a file to with the hope of writing to handle 3 but it does not work! It works fine for handle 1 and handle 2. using Microsoft.Win32.SafeHandles; using System; using System.Collections.Generic; using S...

- 1. In the following, how do we decide which handle is written to stdout, handle 2 or handle 4? :?: I think redirections are sorted for target handles in ascending order because Interpretation 1 should fail with duplication error when we try 1>&4. So, interpretation 2 works when 1>&2 applied and th...

Handle2 writes to console because stderr is connected to stdout by default. Is this right? :?: And piped commands could only read from stdin which comes from the stdout of the piping command. So, stderr is not connected to stdout when piping. Is this right? :?: ( echo Output1 echo Output2 >&2 ) echo...

Thanks Dave. I thought about running algorithm in block statements but not so careful and missed the handle 5s case.

@penpen check this for the algorithm using duplicate handle and force duplicate handle.

Art of assembly book, chapter 19.1.5 Redirection of I/O for Child Processes

https://www.plantation-productions.com/ ... HEADING3-4

So, i mixed up things in previous post. After reading https://www.dostips.com/forum/viewtopic.php?t=6610&start=15#p43422 , i could understand it better but still have some suspicions. This one is fine. ( echo Output1 echo Output2 >&2 echo Output3 >&3 echo Output4 >&4 echo Output5 >&5 ) 1>&2 2>&3 | (...

Hi Aacini, Actually i want to lean how this stuff works and i am not sure i learned with well after trying your sample. I tried it with following to understand what is happening. Error is redirected to standard input or output :) but not sure about inner mechanics. So could you explain it please. @e...

Thank you Aacini for the answer, i will check that article.

Aacini wrote: ↑

16 Jul 2020 06:18

I suggest you to read this thread about using several standard handles to read several input files.

Antonio

I learned mechanics of redirections from dbenham's explanations at https://www.dostips.com/forum/viewtopic.php?p=14612#p14612 So, i come up with following it works fine but handles seem to be messed up as penpen told and it could not read stdin when it's launched again. @echo off setlocal EnableDela...

hi penpen, thanks for the comprehensive answer. :D :wink: I tried following and some other variations to reset stdin at the end but it did not help. How could we restore handles at the end to terminate smoothly without exiting cmd.exe instance? (echo off) 5<variables.txt endlocal I realized that it ...

That's good. I have the batch file calling itself version.
But I am still curios why go-to does not work and why the second one works but exits.

I could achieve it with following but it exits current command line without any error(may be the weird redirection is culprit) so i call it with cmd/c bat.cmd. So why does it exit? Do you have any idea? bat.cmd @echo off setlocal EnableDelayedExpansion set "ndx=0" (@echo off<&4 4<&3) 3<variables.txt...

I use following to read from a file but it does not continue reading after first line. I do not want to use a for-loop and want to experiment with set/p. So, how could i achieve reading from a file in a loop(without for-loop)? I tried staged redirection but failed. @echo off setlocal EnableDelayedEx...

Another workaround is to redefine parenthesis :) ; - opening parenthesis with the escaped (!& and - a command delimiter - with the escaped !& Rules: - First command could be on the same line as opening parenthesis or on the next line without any space between. - It works when there is a space betwee...