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Subject: Trying to execute a command from inside of Ada
From: John Smith <yoursurrogategod@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:52902
Date: 2018-06-03T20:17:31-07:00
List-Id: <comp.lang.ada>

Hello,

I found the following example:

http://rosettacode.org/wiki/Execute_a_system_command#Ada

And this is how I tried to adapt it to Linux:





with Interfaces.C;

with Ada.Text_IO;     use Ada.Text_IO;
with GNAT.OS_Lib;     use GNAT.OS_Lib;

procedure Sys_Command is
   Result    : Integer;
   Arguments : Argument_List :=
                 (  1=> new String'("bash"),
                    2=> new String'("ls -l ~")
                 );
begin
   Spawn
   (  Program_Name           => "bash",
      Args                   => Arguments,
      Output_File_Descriptor => Standout,
      Return_Code            => Result
   );
   for Index in Arguments'Range loop
      Free (Arguments (Index)); -- Free the argument list
   end loop;
end Sys_Command;




The problem is that 'ls -l ~' is not executed correctly.  I don't see any out put at all.  What am I doing wrong?