====== How to install HEC-RAS on Linux ======

Login to the Linux machine. In this example, we use NMSU's Discovery node ''discovery-l2'':
<code bash>
# connect to the NMSU network using either Wi-Fi or VPN
ssh NMSU_username@discovery-l2
# type your NMSU password
</code>

Download the [[https://www.hec.usstart?rev=1721575766ace.army.mil/software/hec-ras/downloads/HEC-RAS_610_Linux.zip|HEC-RAS 6.1.0 Linux version]].
<code bash>
mkdir -p ~/archive/hecras
cd ~/archive/hecras
wget https://www.hec.usace.army.mil/software/hec-ras/downloads/HEC-RAS_610_Linux.zip
</code>

Uncompress the downloaded file.
<code bash>
mkdir -p ~/usr/local/opt
cd ~/usr/local/opt
unzip ~/archive/hecras/HEC-RAS_610_Linux.zip
mv HEC-RAS_610_Linux hecras
</code>

Uncompress Linux binaries.
<code bash>
cd hecras
unzip RAS_Linux_test_setup.zip
</code>

Move binaries and libraries to ''~/usr/local/opt/hecras''.
<code bash>
mv RAS_Linux_test_setup/Ras_v61/Release bin
chmod a+x bin/*
mv RAS_Linux_test_setup/libs lib
</code>

Set up environment variables for HEC-RAS. Don't type it; copy-paste ''cat << 'EOT'...EOT'' into the terminal.
<code bash>
cat << 'EOT' >> ~/.bash_profile
# HEC-RAS                    
export PATH="$HOME/usr/local/opt/hecras/bin:$PATH"
export LD_LIBRARY_PATH="$HOME/usr/local/opt/hecras/lib:$HOME/usr/local/opt/hecras/lib/mkl:$HOME/usr/local/opt/hecras/lib/rhel_8:$LD_LIBRARY_PATH"
EOT

. ~/.bash_profile
</code>

Let's test it.
<code bash>
cd RAS_Linux_test_setup/Muncie
cp wrk_source/Muncie.p04.tmp.hdf .
RasUnsteady Muncie.c04 b04
</code>

Did it run?

Delete extra files and directories.
<code bash>
cd ../..
rm -rf RAS* remove*
</code>