How to get ERRORLEVEL for each command in FOR LOOP?

Question

I am comparing a list of files from 2 folders using a windows batch file. It prints the results whether PASS/FAIL.

Current Working Batch File:

for /F "tokens=*" %%f in (list.txt) do compare Folder1\%%f.png Folder2\%%f.png

If there are 3 files, the output after running this command would look like this:

PASS
FAIL
PASS

If I echo the %ERRORLEVEL% here, it would return 0 because the for loop ran fine.

echo %ERRORLEVEL%

0

My Requirement

Echo the result of each command in the FOR loop instead.

My Expected Output

0
1
0

How do I change the batch file to achieve this?

sohaib · Accepted Answer · 2017-09-18 19:39:16Z

4

Assuming that FAIL changes the ERRORLEVEL, Use & to echo ERRORLEVEL for each command:

SETLOCAL EnableDelayedExpansion
for /F "tokens=*" %%f in (list.txt) do compare Folder1\%%f.png Folder2\%%f.png & echo !ERRORLEVEL!
ENDLOCAL

OUTPUT:

PASS
0
FAIL
1
PASS
0

I assume PASS/FAIL is the output of your compare utility. To hide this output use redirection > to NUL like this:

SETLOCAL EnableDelayedExpansion
for /F "tokens=*" %%f in (list.txt) do compare Folder1\%%f.png Folder2\%%f.png > NUL & echo !ERRORLEVEL!
ENDLOCAL

OUTPUT:

0
1
0

From documentation:

& : command1 & command2

Use to separate multiple commands on one command line. Cmd.exe runs the first command, and then the second command.

edited Sep 18, 2017 at 19:39

answered Sep 18, 2017 at 18:34

sohaib

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4 Comments

aschipfl Over a year ago

This cannot work, because: 1. you need delayed expansion for !ErrorLevel! to get the ErrorLevel of the iteration; otherwise, the ErrorLevel present when reading the entire command line is returned; 2. && prevents non-zero ErrorLevels to be returned, you must use & instead;

sohaib Over a year ago

@aschipfl, sorry for overlooking. I have updated the answer and added documentation as well. Thanks for pointing out.

AutoTester999 Over a year ago

I tried this. Getting the below output: PASS !ERRORLEVEL! FAIL !ERRORLEVEL! PASS !ERRORLEVEL!

aschipfl Over a year ago

@InsecureNoob, then you forgot to enable delayed expansion obviously...

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