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I am having huge problems with my PATH and LD_LIBRARY_PATH since I have installed new libraries. Generally speaking: I can't export permanently my PATH variables defined in my ~/.bashrc file. As example: when I boot and I type which mpiexec, I would expect the one linked to my mpich library defined in my~/.bashrc file, however, I get another one which is:

/usr/bin/mpiexec // vs expected output: /home/mpich/bin/mpiexec

So every time I need to manually type: PATH=/home/mpich/bin:$PATH ; export PATH, and I can't live with this as I have multiple libraries.

What I did:

  1. Modify the bashrc with all my libraries using: sudo nano ~/.bashrc, Output:

    export PATH=$PATH:/usr/local/cuda-10.1/bin

    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/cuda-10.1/lib64

    export CUDA_HOME=/usr/local/cuda-10.1

    export PATH=$PATH:/snap/bin

    export PATH=$PATH:/usr/bin

    epxort PATH=$PATH:/bin

    export PATH=$PATH:/home/mpich/bin

    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/mpich/lib

    export PATH=$PATH:/home/opt/openmpi/bin

    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/opt/openmpi/lib

  2. Edit the environment variables in /etc/environment Output:

PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/mpich/bin:/home/opt/openmpi/bin"

  1. type $ source ~./bashrc
  2. reboot

However, none of the above allow me to retrieve my PATH variables when booting.

So my question is : Where is the error relying and how could I export permanently my path variables defined in ~/.bashrc ? I am running on Ubuntu 18.04.

Any help would be more than appreciated as I have been spending hours on this problem. Thanks in advance

Joachim Bsh
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  • (1) Instead of typing ls after cd, type pwd - you will likely see you are already in /home/joachim (2) export PATH=/usr/local/cuda-10.1/bin overwrites anything you assigned in /etc/environment (3) in ~/.bashrc you add /usr/bin to $PATH but not /bin so it's no surprise that /bin/ls is not found – steeldriver Sep 19 '20 at 08:28
  • @steeldriver thanks a lot for your response. The first point works indeed. For the second, I have edited this path as the others, and updated my question. Is it correct so ? (see my updated question). For the third point, I added the /bin folder and indeed typing ls now works, but still, there are other path variables which are still not taken into account (see updated question). Thank you anyway for your fast answer – Joachim Bsh Sep 19 '20 at 09:01
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    just as a note. –  Sep 19 '20 at 11:50
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    As @bacon's link points out, order is important - since you append /usr/bin then append /home/mpich/bin, it is expected that which mpiexec will find the former first – steeldriver Sep 19 '20 at 12:28

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