As a summary: I wanted to install the latest SCilab, which is not available in the Software centre. I downloaded the tar.gz file from the website. I then followed the instructions from response 7 here How to install a .tar.gz (or .tar.bz2) file?. This didn't work for me. So I removed the file (I think), and extracted the file a different way and ran the program from there.
Okay, so I downloaded Scilab from their website as a tar.gz file.
I then copied the file to /opt:
sudo cp [download name].tar.gz /opt/
I then extraced the file and deleted the tar.gz file:
sudo tar -xvf [download name].tar.gz sudo rm -rf [download name].tar.gz
I found the folder. It was called Scilab-5.4.1. I think the next step changes the "access" settings, and so I changed it as follows:
sudo chmod 770 Scilab-5.4.1/
So this is owner and group permission to read, write and execute.
I then tried the symbolic link thing:
sudo ln -s /opt/Scilab-5.4.1/ /usr/bin/scilab
After this, I tried different ways to run the programme from the terminal, but to no avail. I then looked for the Scilab folder, which I found in opt. I tried to delete the folder "Windows-style" (send to recycling bin) but it wouldn't let me. I also tried purge from the terminal but it couldn't find the programme. I then used:
sudo rm -r /opt/Scilab-5.4.1
The folder disappeared. After this, I downloaded the file again, and transferred it to opt in the process:
sudo tar xzvf [download name].tar.gz -C /opt/
I then went to the folder (in terminal):
And opened Scilab:
This seems to work. However, there is a Scilab programme logo in the launcher (Unity), but it disappears on closing the programme and there is no logo in the recently used programmes section in the dash.
I want to know that was there an error in my installing process done in the previous unsuccessful install, since I can't find the Scilab logo anywhere ?
Why first method didn't work but the second, simpler method, seemed to work okay (I can at least open the programme) ?
(The final peculiar thing is my "history" in the terminal: using the up-arrow to navigate to previous commands, the history suggests I didn't use
rm -r, even though I am almost certain I did.)