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I'm using Windows 11 with WSL 2 Ubuntu 18.04 as Guest OS. I have written the following script as part of ~/.bash_profile with the intent to set the PRELUDE_HOST env variable both in my Ubuntu OS and on the Windows OS:

export PRELUDE_HOST=10.10.225.241
WINDOWS_PRELUDE_HOST=`cmd.exe /c echo %PRELUDE_HOST%`
if [[ "$PRELUDE_HOST" != "$WINDOWS_PRELUDE_HOST" ]]
then
    cmd.exe /c setx PRELUDE_HOST $PRELUDE_HOST
fi

The first time I run this script - the PRELUDE_HOST env is set onto the Windows OS globally. But for some reason, if I run the script a second time - the string comparison doesn't work as expected and the cmd.exe /c setx PRELUDE_HOST $PRELUDE_HOST runs a second time.

I can't figure out why the if [[ "$PRELUDE_HOST" != "$WINDOWS_PRELUDE_HOST" ]] comparison is not working as expected. Any suggestions?

helvete
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mdzh
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  • Please add to your question output of: `echo "$WINDOWS_PRELUDE_HOST" | hexdump -C` – Cyrus Mar 18 '22 at 11:01
  • Well apparently the strings are different. Try printing/logging them. – Gereon Mar 18 '22 at 11:02
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    Output of `cmd.exe` will have CRLF line ending. The CR will remain after its captured by `` `...` `` (should be `$(...)`). See [Are shell scripts sensitive to encoding and line endings?](https://stackoverflow.com/q/39527571/4154375) and [How to convert Windows end of line in Unix end of line (CR/LF to LF)](https://stackoverflow.com/q/3891076/4154375). – pjh Mar 18 '22 at 11:17
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    Try `"${WINDOWS_PRELUDE_HOST%$'\r'}"` to remove the carriage return. – dan Mar 18 '22 at 12:47
  • Removing the carriage return worked like a charm! Thank you! – mdzh Mar 19 '22 at 15:43

1 Answers1

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I had a similar issue (WSL generated string versus Linux string saved in a file). Printed out the respective length. They were different by one. Printed each character for the length, unexplainable characters also printed for the WSL string. Had to trim the string by the known length before comparison.

Beeyoung
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