clang --version permission denied error - c++

Question

I have installed the latest clang-6.0 using the instructions from here:
install latest clang (6.0) on Ubuntu 16.04 (xenial) / WSL. Basically, these are the steps:
wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
sudo apt-add-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-6.0 main"
sudo apt-get update
sudo apt-get install -y clang-6.0
It was successful but while checking for the version I'm getting the following error
❯ clang --version
⏎
zsh: permission denied: clang
What's the issue here and how to resolve this?

Answer 1

The way you are installing, the clang binary is being installed at /usr/bin/clang-6.0. However, you are trying to run clang --version. This is likely to avoid clobbering in case you have multiple versions of clang installed.
You have 2 options:
Install clang without the version, apt-get install clang, which should still install clang 6 since it is in your package list.
Use the binary by the correct name, clang-6.0 --version
I tested this out using the following Dockerfile:
FROM ubuntu:16.04
# Install software we need to test
RUN apt-get update && apt-get install -y \
software-properties-common \
wget \
zsh
# Get clang-6.0 package
RUN wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add - && \
apt-add-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-6.0 main"
# Install clang-6.0 package
RUN apt-get update && apt-get install -y \
clang-6.0
# Default to shell
ENTRYPOINT ["zsh"]
I get the output:
# which clang
clang not found
# which clang-6.0
/usr/bin/clang-6.0