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  • awk: cmd. line:2: warning: regexp escape sequence `\ ' is not a known r

    From hongyi.zhao@gmail.com@21:1/5 to All on Thu Feb 17 05:43:45 2022
    Today, on Ubuntu 20.04.3 LTS, when I'm running some tests of vasp [1], I encounter the awk warning as follows:

    ```
    awk: cmd. line:2: warning: regexp escape sequence `\ ' is not a known regexp operator
    ```

    The awk version is as follows:

    ```
    $ awk --version
    GNU Awk 5.0.1, API: 2.0 (GNU MPFR 4.0.2, GNU MP 6.2.0)
    ```

    I also noticed the discussion here [2], it says the following:

    ```
    It's a problem of gawk,I downgrade gawk from 5.0.1 to 4.2.1 then this report of "awk : cmd..." disappeared.
    ```

    However, I am not sure if this is harmful. Any hints/explanations/fixings/workarounds will be highly appreciated.

    [1] https://www.vasp.at/
    [2] https://github.com/KittyKatt/screenFetch/issues/627#issuecomment-512685269

    Regards,
    HZ

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  • From Ed Morton@21:1/5 to hongy...@gmail.com on Thu Feb 17 08:24:33 2022
    On 2/17/2022 7:43 AM, hongy...@gmail.com wrote:
    Today, on Ubuntu 20.04.3 LTS, when I'm running some tests of vasp [1], I encounter the awk warning as follows:

    ```
    awk: cmd. line:2: warning: regexp escape sequence `\ ' is not a known regexp operator
    ```

    The awk version is as follows:

    ```
    $ awk --version
    GNU Awk 5.0.1, API: 2.0 (GNU MPFR 4.0.2, GNU MP 6.2.0)
    ```

    I also noticed the discussion here [2], it says the following:

    ```
    It's a problem of gawk,I downgrade gawk from 5.0.1 to 4.2.1 then this report of "awk : cmd..." disappeared.
    ```

    However, I am not sure if this is harmful. Any hints/explanations/fixings/workarounds will be highly appreciated.

    [1] https://www.vasp.at/
    [2] https://github.com/KittyKatt/screenFetch/issues/627#issuecomment-512685269

    Regards,
    HZ

    You showed us everything except the command you ran to produce the
    warning. It's like asking your mechanic to diagnose your car trouble
    without letting them see your car. Not sure how you expect us to help
    you with hints/explanations/fixings/workarounds for code we can't see.

    Ed.

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  • From Kenny McCormack@21:1/5 to mortonspam@gmail.com on Thu Feb 17 15:27:35 2022
    In article <sullr0$noo$1@dont-email.me>,
    Ed Morton <mortonspam@gmail.com> wrote:
    ...
    You showed us everything except the command you ran to produce the
    warning. It's like asking your mechanic to diagnose your car trouble
    without letting them see your car. Not sure how you expect us to help
    you with hints/explanations/fixings/workarounds for code we can't see.

    Well, it is Hongy, so you try to help at your own risk. The danger of
    getting irretrievably caught in quicksand is always present.

    But it is far from clear to me that there is any problem here. That there
    is anything to "fix". Two facts of life are:

    1) Any interpreter or compiler is free to warn about anything it wants to
    warn about. Obviously, earlier versions of (G)AWK did not always complain about "superfluous" backslashes, but this is an area where GAWK has been
    making improvements recently.

    2) When building FOSS stuff, sometimes you just have to accept that
    warnings can happen, and you have to learn to ignore them (for the most
    part). Of course, when writing your own code, you should try as hard as possible to fix all warnings, so you get "clean compiles", but with other people's stuff, sometimes you just have to accept that we live in an
    imperfect world.

    Finally, if you (i.e., Hongy) really wanted/needed to "fix" this, you'd
    just have to find whatever line of code is causing the warning to be
    emitted and "fix" it. Whether or not this is worth the bother, is
    something you'll have to decide on your own.

    --
    Trump - the President for the rest of us.

    https://www.youtube.com/watch?v=C8jSzLAJn6k

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