Multi-lined command output set as variable

Question

So I've googled and searched stackflow; I think the output for the library I'm using and the way it's structured makes none of the answers work.

I downloaded a windows library called totp2 for command prompt. I am executing the command in my batch file and that works fine, but it wants to return the line I passed.

I'm looking to run the command, and only assign the very last line to a variable; stripping the word OTP: from the last line.

C:\Users\Dan\Desktop\devBash> t2otp.exe QQRZO4QIGPJFXS2QXDIL4JUO2KKQCPTOF2D5AX5M3R2VH5NM2ZUSXIXGP4WPMVTR sha256 6 30

T2OTP v2 - Command line TOTP Generator (c) TOKEN2
Algorithm: sha256
Seed: QQRZO4QIGPJFXS2QXDIL4JUO2KKQCPTOF2D5AX5M3R2VH5NM2ZUSXIXGP4WPMVTR
Interval: 30 seconds
OTP length: 6 digits
    
OTP: 666323

The above is exactly how it returns the command prompt results, with the code being on line 7 of the command output.

Current Code (hardcoded command just for testing):

For /F "EOL=/" %%A In ('t2otp.exe QQRZO4QIGPJFXS2QXDIL4JUO2KKQCPTOF2D5AX5M3R2VH5NM2ZUSXIXGP4WPMVTR sha256 6 30') Do Set "totp=%%A"

However that returns just OTP:

Current Result:

OTP: 666323

Needed Result:

Any help is really really appreciated.

And yes; it's a demo secret.

Wow..... so simple... I tried about 5 different versions of tokens and delims, and just went back to read the docs again.... Thanks... a bunch <3 — Oort
– Oort, Commented Sep 26, 2022 at 3:03

Oort · Accepted Answer · 2022-09-26 03:06:08Z

1

For /F "Tokens=2 eol=/" %%A In ('t2otp.exe QQRZO4QIGPJFXS2QXDIL4JUO2KKQCPTOF2D5AX5M3R2VH5NM2ZUSXIXGP4WPMVTR sha256 6 30') Do Set "hash=%%A"

Easy way to feel dumb is when the answer is so simple. Solved.

answered Sep 26, 2022 at 3:06

Oort

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Comments

Emin · Accepted Answer · 2022-09-27 07:30:44Z

0

An even simpler answer is to add "clean" parameter at the end of the command (as described in Token2's documentation):

the last argument is optional, if argument equals to 'loop' , the tool will stay launched recalculating the current OTP until stopped with Ctrl+C, if the argument is 'clean' the tool will produce the OTP only

So the code below:

t2otp.exe QQRZO4QIGPJFXS2QXDIL4JUO2KKQCPTOF2D5AX5M3R2VH5NM2ZUSXIXGP4WPMVTR sha256 6 30 clean

Will give you only the OTP (6 digits in your example)

edited Sep 27, 2022 at 7:30

answered Sep 27, 2022 at 7:23

Emin

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