[OpenFOAM.org] Source or executre startup file for OpenFOAM

t.oliveira · November 1, 2015, 12:43

The installation instructions on http://www.openfoam.org/download/ubuntu.php tell the user to add the following line at the bottom of ~/.bashrc:

Code:

source /opt/openfoam240/etc/bashrc

However, the after installing openfoam240 via apt-get install, the user is instructed to add the following line instead:

Code:

.  /opt/openfoam240/etc/bashrc

Apparently, there is a difference between executing and sourcing a bash script (http://superuser.com/questions/17678...g-a-bash-scrip).
Do both alternatives work the same?

alexeym · November 1, 2015, 13:45

Hi,

Yes, there is difference between sourcing and executing but

Code:

. /opt/openfoam240/etc/bashrc

is not execution of the script. This is an excerpt from man bash:

Code:

        .  filename [arguments]
       source filename [arguments]
              Read and execute commands from filename in the current shell environment and return the exit  status  of
              the  last  command executed from filename. ...

In fact the same said in the last paragraph of Terminology section on the page you have mentioned in your post.

t.oliveira · November 2, 2015, 06:21

Thank you, alexeym!
And sorry, a more attentive reading would have been enough.

November 1, 2015, 12:43	Source or executre startup file for OpenFOAM	#1
t.oliveira Senior Member Thomas Oliveira Join Date: Apr 2015 Posts: 114 Rep Power: 12	The installation instructions on http://www.openfoam.org/download/ubuntu.php tell the user to add the following line at the bottom of ~/.bashrc: Code: source /opt/openfoam240/etc/bashrc However, the after installing openfoam240 via apt-get install, the user is instructed to add the following line instead: Code: . /opt/openfoam240/etc/bashrc Apparently, there is a difference between executing and sourcing a bash script (http://superuser.com/questions/17678...g-a-bash-scrip). Do both alternatives work the same?

November 1, 2015, 13:45		#2
alexeym Senior Member Alexey Matveichev Join Date: Aug 2011 Location: Nancy, France Posts: 1,938 Rep Power: 39	Hi, Yes, there is difference between sourcing and executing but Code: . /opt/openfoam240/etc/bashrc is not execution of the script. This is an excerpt from man bash: Code: . filename [arguments] source filename [arguments] Read and execute commands from filename in the current shell environment and return the exit status of the last command executed from filename. ... In fact the same said in the last paragraph of Terminology section on the page you have mentioned in your post. wyldckat likes this.

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November 2, 2015, 06:21		#3
t.oliveira Senior Member Thomas Oliveira Join Date: Apr 2015 Posts: 114 Rep Power: 12	Thank you, alexeym! And sorry, a more attentive reading would have been enough.