In /usr/bin/x86_64-linux-gnu-python3.9-config line 8:
    exit $1
         ^-- SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
    exit "$1"


In /usr/bin/x86_64-linux-gnu-python3.9-config line 18:
    RESULT=$(dirname $(cd $(dirname "$1") && pwd -P))
                     ^-----------------------------^ SC2046: Quote this to prevent word splitting.
                          ^-------------^ SC2046: Quote this to prevent word splitting.


In /usr/bin/x86_64-linux-gnu-python3.9-config line 24:
    echo $RESULT
         ^-----^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
    echo "$RESULT"


In /usr/bin/x86_64-linux-gnu-python3.9-config line 47:
LDLIBRARY="libpython${VERSION}${ABIFLAGS}.a"
^-------^ SC2034: LDLIBRARY appears unused. Verify use (or export if used externally).


In /usr/bin/x86_64-linux-gnu-python3.9-config line 50:
LDVERSION="${VERSION}${ABIFLAGS}"
^-------^ SC2034: LDVERSION appears unused. Verify use (or export if used externally).


In /usr/bin/x86_64-linux-gnu-python3.9-config line 51:
LIBDEST=${prefix_real}/lib/python${VERSION}
^-----^ SC2034: LIBDEST appears unused. Verify use (or export if used externally).


In /usr/bin/x86_64-linux-gnu-python3.9-config line 54:
PYTHONFRAMEWORK=""
^-------------^ SC2034: PYTHONFRAMEWORK appears unused. Verify use (or export if used externally).


In /usr/bin/x86_64-linux-gnu-python3.9-config line 60:
for ARG in $*
           ^-- SC2048: Use "$@" (with quotes) to prevent whitespace problems.

For more information:
  https://www.shellcheck.net/wiki/SC2034 -- LDLIBRARY appears unused. Verify ...
  https://www.shellcheck.net/wiki/SC2046 -- Quote this to prevent word splitt...
  https://www.shellcheck.net/wiki/SC2048 -- Use "$@" (with quotes) to prevent...