SQL Run bash scripts and return the data to SQL in ASCII

bash_table_bin.sql

-- Run a bash command or script and returns the stdout as a table.
-- Each text line will be a row in the result set - the magic is done by the cool "pipe" statement.
-- Data is returned in binay (ASCII) so you need the ASC_TOO_EBCDIC to look at at the rows from with in ACS
-- So if you just heed to run bash text then use my gist bash_table 
--
-- It assumes bash is installed by YUM so 
-- it will be in the default location /QOpenSys/pkgs/bin/bash
-- You can use this aproach to other shells like sh, qsh setc.
-- You need to have the "ifs_write" procedure found on my gist
-- You also need library QSYSINC installed:
-- https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_74/apiref/conQSYSINC.htm
-- 
-- Simply paste this gist into ACS SQL and step through the example.
--
-- It is a cool example how far you can go with SQL: Have fun - 
-- (C) Niels Liisberg 2021-2023
--
-- This gist is distributed on an "as is" basis, without warranties 
-- or conditions of any kind, either express or implied.
----------------------------------------------------------------------------------------------
call qusrsys.ifs_write('/tmp/openfile.c' , '
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <QP2SHELL.h> 
{
    char cmd [32000];
    memcpy ( cmd , BASH_TABLE_BIN.COMMAND.DAT   ,  BASH_TABLE_BIN.COMMAND.LEN);
    strcpy ( cmd + BASH_TABLE_BIN.COMMAND.LEN   , ">"); 
    strcpy ( cmd + BASH_TABLE_BIN.COMMAND.LEN+1 , MAIN.TEMPNAME);  
    QP2SHELL ("/QOpenSys/pkgs/bin/bash" , "-c" , cmd);
    *strchr(MAIN.TEMPNAME,'' '') = 0x00;
    MAIN.STMF =  open (MAIN.TEMPNAME , O_RDONLY );
}
');
call qusrsys.ifs_write('/tmp/readfile.c' , '
    MAIN.BUF.LEN =  read (MAIN.STMF, MAIN.BUF.DAT, sizeof(MAIN.BUF.DAT)); 
');
call qusrsys.ifs_write('/tmp/closefile.c' , '
    close  (MAIN.STMF);
    unlink (MAIN.TEMPNAME); 
');

create or replace function qusrsys.bash_table_bin (
    command varchar(32000) ccsid 65535
) 
returns table ( stdout  varchar(32000) ccsid 65535 )
set option output=*print, commit=*none, dbgview = *source --list
main: 
begin

      declare stmf int ;
      declare endpos int;
      declare NEWLINE char(1) for bit data;
      declare buf varchar(4096) for bit data default '';
      declare rest varchar(4096) for bit data default'';
      declare tempname char(64);
      set  tempname =  '/tmp/f' || now() || '.txt'  ;
  
      include '/tmp/openfile.c';
      include '/tmp/readfile.c';
  
      set NEWLINE = x'0A';
      
      while length(buf) > 0 do
          repeat
             set endpos = position(NEWLINE , buf);
             if endpos > 0 then
                pipe (rest concat  substring(buf, 1 , endpos));
                set buf = substring(buf, endpos + 1);
                set rest = '';
             else
                set rest = rest concat buf;
                set buf  = '';
             end if;
          until endpos = 0          
          end repeat;
          include '/tmp/readfile.c';
      end while;
      if length(rest) > 0 then
        pipe (rest);
      end if;
      include '/tmp/closefile.c';
  
  return;
end;

stop;
-- Use cases
------------

-- List home directories 
select ascii_to_ebcdic(stdout) from table  (qusrsys.bash_table_bin ('cd /home;ls')) a; 

-- List all files for all users in their home directory
select 
    authorization_name, 
    home_directory  , 
    bash.* 
from qsys2.user_info, 
lateral ( 
    Select ascii_to_ebcdic(stdout) as "Files in home dir" 
    from table (
        bash_table_bin ('cd ' || cast(home_directory as varchar(256)) || ';ls')
    )   
) bash;