Getting Started: mkdir missing operand
 

I have exactly the same problem:

Error:

How to declare the variable???

:confused:

Hi,

variable FOAM_RUN is defined on line 204 of $WM_PROJECT_DIR/etc/config/settings.sh file.

If yours is empty, it seems you've forgotten to set up environment with

Thanks! I need to learn more about OpenFOAM Environment Variables. That did solve my problem:

mkdir: missing operand
 

Hello,

I am new to OpenFOAM and Ubuntu.

When I try to do the following:

mkdir -p $FOAM_RUN

I get the following error:

mkdir: missing operand
Try 'mkdir --help' for more information.

Can someone help me please. Remember, I am new to OpenFOAM and UBuntu. So please be detailed with your help.

Quick question/answer: Knowing which version of OpenFOAM and Ubuntu, as well as which installation instructions you've followed, would make it easier to diagnose the problem.

So, I'll try guessing that you installed OpenFOAM 5 Deb package(s) on Ubuntu 16.04 or 17.10, in which case, you will need to run the following command to activate this version of OpenFOAM:
For more details, read the respective version's section "User Configuration" here: https://openfoam.org/download/5-0-ub...-configuration

Then you should be able to run the command:
without any problems... or at least I hope so, unless something went wrong during the installation.