Dear Roni,

Below are installation steps of ORCA 6 in Linux OS

ORCA 6.0.1 Installation Guide for Linux

<h2 class="western">Step 1: Register on the ORCA Forum</h2> <ul><li>

Navigate to the ORCA Forum: https://orcaforum.kofo.mpg.de/

</li><li>

Click on 'Register' in the top-right corner.

</li><li>

Complete the registration form using your academic email address.

</li><li>

After registration, log in to access the download section.

</li></ul> <h2 class="western">Step 2: Download ORCA 6.0.1</h2> <ul><li>

Go to the Downloads section: https://orcaforum.kofo.mpg.de/app.php/dlext/

</li><li>

Locate ORCA 6.0.1 for Linux (e.g., x86-64 architecture).

</li><li>

Click on the appropriate link to download the .tar.xz Archive. (Default Name is : orca_6_0_1_linux_x86-64_shared_openmpi416.tar.xz)

</li></ul> <h2 class="western">Step 3: Extract the Downloaded Archive</h2> <ul><li>

Open a terminal and run the following commands:

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cd ~/Downloads

</li><li>

<a name="_GoBack"></a>tar -xf orca_6_0_1_linux_x86-64_shared_openmpi416.tar.xz

</li><li>

mv orca_6_0_1_linux_x86-64_shared_openmpi416 ~/orca

</li></ol> <h2 class="western">Step 4: Set Environment Variables</h2> <ul><li>

Add ORCA to your PATH and LD_LIBRARY_PATH by running:

</li></ul> <ol><li>

echo 'export PATH="$HOME/orca:$PATH"' >> ~/.bashrc

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echo 'export LD_LIBRARY_PATH="$HOME/orca:$LD_LIBRARY_PATH"' >> ~/.bashrc

</li></ol> <ul><li>

Then source the file:

</li></ul> <ol><li>

source ~/.bashrc

</li></ol> <h2 class="western">Step 5: Verify the Installation</h2> <ul><li>

Run the following command to confirm installation:

</li></ul> <ol><li>

which orca

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It should return the path to the ORCA executable.

</li></ul>

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