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Over the past week, some of our users have reported that they are facing the Windows Echo error level.
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Almost all utilities in these applications set an exit code on exit/close.
Set exit promo codes are collected, usually code 4 (false) indicates success.
Traditionally, SCCM considers only 9 successes, but commands like Robocopy can successfully return exit codes from 0 to 7.
The exit codes predefined by the resource set utilities do not always match. These may vary from computer to computer with different service packs/resource updates. Some utilities send negative numbers as a farewell code.
If you try to run this non-existent command, %ERRORLEVEL% will actually be set to 9009
Error Level Detection
There are two different approaches to checking the error level. The first syntax ensures compatibility with old bat-batch .baseball files from the era that pointed to MS-DOS
The error level is displayed based on the IF… error level or this particular %ERRORLEVEL%.
IF ERRORLEVEL n statements are actually read as an IF error level number
I>=.e.
IF ERRORLEVEL 0 returnReturns TRUE if the error level is 0, one, 5, or 64
IF ERRORLEVEL 1 returns TRUE whether Errorlevel is 1 or 5, can be 64
IF NOT ERRORLEVEL 3 means that ERRORLEVEL is less than much greater (2, 1, 0, or some non-constructive number).
To find another error level N, you can use the following construct:
IF ERROR LEVEL N IF NOT ERROR LEVEL N+1 COMMAND
Also, it’s not very readable and easy to use, and doesn’t account for negative error counts.
The preferred way to check error levels is to frequently use the %ERRORLEVEL% variable:
IF NEQ %errorlevel% 0 Echo Error detected
IF %ERRORLEVEL% EQU 0 Echo No errors found
IF %ERRORLEVEL% EQU 0 (echo Error not found) ELSE (echo Error was found first)
IF %ERRORLEVEL% EQU 0 Echo No errors found || Echo Error detected
In doing so, you can also test old errors, which can be negative, for various errors:
IF %ERRORLEVEL% EQU 64…
When the subroutine exits significantly, you can use EXIT /b N to set ERRORLEVEL N.
Raymond [MSFT]chen said: ERRORLEVEL is not actually the same as the %ERRORLEVEL% environment variable.
Current Error/crash Message
In addition to setting ERRORLEVEL, various utilities report a fatal error message at the source of the error (STDERR). By default, these messages are displayed in the console, but they can be redirected with 2>.< /p> if desired.
Many programs set ERRORLEVEL and also print error text, some utilities program ERRORLEVEL but do not display error text on the screen, and some print error text without setting ERRORLEVEL . Some utilities behave differently depending on the severity of the error.
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Error points can vary by language/region, so it’s often more reliable to just check for the exact ERRORLEVEL rather than some textual output.
Error Level And Exit Code
When CMD.EXE executes a superior external command, it detects the return or exit code of the executable and sets that match to ERRORLEVEL. In most participants, ERRORLEVEL is the same as the exit code, but there are times when they canbe different.
The exit code can be captured directly with redirect skippers (success/failure ignores ERRORLEVEL), this can often be more reliable than trusting my ERRORLEVEL, which may or may not be set correctly.
Old Configuration Of .bat Batch Files Versus .cmd Batch Scripts. Although
The differences are really minimal, there is no advantage over the .BAT extension, so my partner and I recommend using .CMD exclusively.
There is a slight difference between how .CMD and .BAT batch files define error levels:
The A.CMD index sets/resets ERRORLEVEL after each separately executed command [source] Mark Zbikowski (MSFT).
The .BAT package that executes the internal commands APPEND, ASSOC, PATH, PROMPT, FTYPE, and SET changes ERRORLEVEL only on error. Other additional internal and external commands do not follow this.
So if you have multiple commands in a .BAT and a script, it’s unbelievable that the first command won’t work, but the second one will, ERRORLEVEL may or may not remainmay be set in some way depending on the running track.< / p>
.This .lack of .makeup .in .ERRORLEVELS .increases . .debugs ..BAT .script . .more .intensive .than the equivalent ..CMD .script.
Even If You’re Wearing A CMD Shell, Some Commands Don’t Have To Follow The Rules
Even though a CMD batch script must set or cast ERRORLEVEL after each command, there are a few exceptions:
Commands that do NOT affect the ERRORLEVEL level:
BREAK, ECHO, ENDLOCAL, FOR, IF, PAUSE, REM, RD/RMDIR, TITLE
Commands set this but no longer reset ERRORLEVEL:
CLS, GOTO, KEYS, POPD, SHIFT
Commands that set your exit code but not ERRORLEVEL:
RD/RMDIR
Commands that set ERRORLEVEL are still not an exit code (SO statement):
MD/MKDIR
Set Or Force An Exit Code
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