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Installing ShellCheck on CentOS 6 / RHEL6

Here are contributed instructions for installing ShellCheck on CentOS 6:

# Haskell Deps. Or read on and use that source in the wiki.
yum -y groupinstall "Development Tools"
yum -y install gmp-devel zlib # may need epel; zlib as shellcheck builddep reported in #519
sudo ln -s libgmp.so.3 /usr/lib64/libgmp.so.10 # HACK

# Get haskell. https://www.haskell.org/platform/linux.html#linux-generic
# Or follow https://wiki.haskell.org/GNU/Linux#RHEL.2C_CentOS.2C_Scientific_Linux_5_and_6_and_Fedora_16_and_17.
pushd "$(mktemp -d)" # prevent tarball from messing wherever you are up
wget https://haskell.org/platform/download/7.10.2/haskell-platform-7.10.2-a-unknown-linux-deb7.tar.gz
tar xvzf haskell-platform-7.10.2-a-unknown-linux-deb7.tar.gz
./install-haskell-platform.sh
popd

# do the normal cabal thing
cabal update
cabal install shellcheck
cp ~/.cabal/bin/shellcheck /usr/local/bin