Detecting error after a powershell statement is executed - powershell

Question

I am using powershell to run sqlplus and I would like PowerShell to detect if there are error after the script was run and to perform some action instead of me looking at the result file.
& 'sqlplus' 'system/myOraclePassword' '#Test' | out-file 'result.txt';
Normally in DOS, there is %errorlevel% when the command encounters error and I wonder if there is similar stuff in PowerShell?
Of course, I can read the log file myself but sometimes, thing got too routine and I may forget.
My Test.sql:
select level from dual
connect by level<5;
select 10/0 from dual;
quit;
There is clearly a division by zero error. The result.txt captures it but I would like powershell to detect it as well
SQL*Plus: Release 12.1.0.2.0 Production on Thu Apr 27 16:24:30 2017
Copyright (c) 1982, 2014, Oracle. All rights reserved.
Last Successful login time: Thu Apr 27 2017 16:17:34 -04:00
Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
LEVEL
----------
1
2
3
4
select 10/0 from dual
*
ERROR at line 1:
ORA-01476: divisor is equal to zero
Does the powershell statement return an errorlevel after the statement is executed like DOS?
I have tried:
& 'sqlplus' 'system/myOraclePassword' '#Test' | out-file 'result.txt';
if (errorlevel 1)
{ write-host error;
}
else
{ write-host ok;
}
But that has caused syntax error?
errorlevel : The term 'errorlevel' is not recognized as the name of a cmdlet,
function, script file, or operable program. Check the spelling of the
name, or if a path was included, verify that the path is correct and
try again.
What is a proper way to check error in powershell?
UPDATE
I used this:
if ($LASTEXITCODE -ne 0 )
{
write-host error;
}
else
{
write-host ok;
}

Answer 1

Since you are invoking an executable, you probably want to check for the $LASTEXITCODE variable or the return value of sqlplus. In PowerShell each variable has a $ prefix.