Output Redirection with Start-Process for DB export

i'm trying call db export command using start-process powershell , capture of output.
i'm using powershell 2.0 on win2008 r2.
below various attempts i've made @ , notes on results.

i'm finding if use -redirectstandardoutput , -redirectstandarderror, nothing stdout , stderr capturing not of output (1479 lines - missing 40, maybe hitting line or memory limit?).
if try use unix-like redirects (2>&1>>logfile), initial line output handles, etc , invalid characters export lines should be, it's kind of encoding problem.  out-file , tee produce similar results.

i'm hoping might have insight why stdout , stderr seem reversed , if there limits stderr.  or if there method address encoding issue using unix redirects.

example of unix-like redirect output:
handles  npm(k)    pm(k)      ws(k) vm(m)   cpu(s)     id processname                                                  
-------  ------    -----      ----- -----   ------     -- -----------                                                  
     20       1      304        144     3     0.03  11640 expdp                                                        

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variables used in snippets below avoid questions what's running.
$strexportexe = "c:\oracle\product\11.2.0\dbhome_1\bin\expdp.exe"
$strdate3 = get-date -format yyyymmdd_hh_mm_ss
$strexportfile = "${strinstance}_${strdate3}.exp"
$strarguments = "system/$strpwrd full=y directory=backup_dir dumpfile=$strexportfile"
$strbackuplog = "$stropslog\backup_cppc.log"
$strtmpbackupfile = "$stropstmp\tmp_backup_cppc.log"
funclogwrite function append lines main log file($strbackuplog) while adding date/time front of line

various attempts
1. $strprocess = start-process $strexportexe -argumentlist $strarguments -wait -nonewwindow -passthru -redirectstandardoutput $strbackuplog -redirectstandarderror $strtmpbackupfile
  - dumps into  stderror file & nothing in stdout file

2. $strprocess = start-process $strexportexe -argumentlist $strarguments -wait -nonewwindow -passthru 2>&1 >>$strbackuplog
  - doesn't log output screen, invalid characters in example above

3. $strprocess = start-process $strexportexe -argumentlist $strarguments -wait -nonewwindow -passthru 2>&1 -redirectstandardoutput $strbackuplog
  - no data in backup log, redirecting stderr stdout & sending stdout log file

4. $strprocess = start-process $strexportexe -argumentlist $strarguments -wait -nonewwindow -passthru 2>>$strbackuplog >>$strbackuplog
  - throws error "the process cannot access file 'c:\ops\log\backup_cppc.log' because being used process"
    because trying redirect both stderr (2>>) , stdout (>>) same file

5. $strprocess = start-process $strexportexe -argumentlist $strarguments -wait -nonewwindow -passthru 1>&2 -redirectstandarderror $strbackuplog
  - errors "the '1>&2' operator reserved future use."

6. $strprocess = start-process $strexportexe -argumentlist $strarguments -wait -nonewwindow -passthru >>$strbackuplog
  - same bad redirect 2nd 1 2>&1 >>$strbackuplog

7. $strprocess = start-process $strexportexe -argumentlist $strarguments -wait -nonewwindow -passthru | out-file $strbackuplog
  - outputs handles etc , invalid characters in example above

8. $strprocess = start-process $strexportexe -argumentlist $strarguments -wait -nonewwindow -passthru | tee-object -file $strbackuplog
  - same above invalid characters

9. $strprocess = start-process $strexportexe -argumentlist $strarguments -wait -nonewwindow -passthru -outvariable $out
   funclogwrite $out
  - combination sent nothing screen , nothing in $out being written log function funclogwrite

10. $strprocess = start-process $strexportexe -argumentlist $strarguments -wait -nonewwindow -passthru | tee $strbackuplog
  - same invalid characters in example above

11. $strstdout = "$stropslog\stdout.log"
    $strstderr = "$stropslog\stderr.log"
    $strprocess = start-process $strexportexe -argumentlist $strarguments -wait -nonewwindow -passthru -redirectstandardoutput $strstdout -redirectstandarderror $strstderr
    funclogwrite "stdout db backup"
    funclogwrite "======="
    funccopyruntofulllog $strstdout
    funclogwrite "stderr db backup"
    funclogwrite "======="
    funccopyruntofulllog $strstderr

  - code above stdout file empty, stderr file has 1479 lines of output not of export info, missing 40 lines @ end of display on screen

12. $strprocess = start-process $strexportexe -argumentlist $strarguments -wait -nonewwindow -passthru 2>&1>>$strbackuplog
  - same 2. above removed space before log file @ end

after these attempted cmds, i've been using:
$strprocess.hasexited
$strprocess.exitcode
confirm it's finished , capture exitcode.  if other 0 alert issue db export.

you need take issue of how standard outputs use oracle.

using "unix" redirectors not same redirecting child process.  separate , unrelated issues.

---

\_(ツ)_/

Windows Server  >  Windows PowerShell