[SOLVED] Linux: How to detect whether STDOUT was redirected?
lazarus / 32-Linux

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Hartmut · 2018-09-28 16:38

I want a function which tells me, whether STDOUT of my console program
was redirected or not like
   myprogram > outfile

In http://forum.lazarus.freepascal.org/index.php/topic,41936.0.html
there is a solution for Windows, but I need it for Linux (Ubuntu
18.04). Can somebody help?

I'm an absolute beginner on Linux, so please be not to short in your
answer. Thanks a lot in advance.

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mpv · 2018-09-28 19:08

You can check stdout is a terminal using isatty() function. If not
then stdout is redirected

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Hartmut · 2018-09-28 19:41

That sounds interesting. But I don't find this function, in which unit
is it?
http://www.math.uni-leipzig.de/pool/tuts/FreePascal/units/node12.html#
SECTION0012369000000000000000
says it is in unit "Linux", but I still get a compilation error:
Identifier not found "IsATTY"

Thanks for your help.

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alex256 · 2018-09-28 19:50

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i uses   
termio;

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Thaddy · 2018-09-28 20:04

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i {$ifdef
fpc}{$mode delphi}{$H+}{$endif}uses
termio;beginwriteln(IsATTY(output));end.

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Thaddy · 2018-09-28 20:05

Alex , posts crossed.

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Hartmut · 2018-09-28 20:13

It works! Thanks a lot to all who helped me.