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What is the appropriate location for this scala.i.e. /opt, /usr/, or /usr/local etc.
Second: if I type # scala in command line, its should comes with:
Welcome to Scala version 2.11.2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_45).
Type in expressions to have them evaluated.
Type :help for more information.
...And it does comes, because I set the environmental variable as :
# export PATH=$PATH:/tmp/scala-2.11.1
Where should I enter this environmental variable so that they are persistent even after reboot. Is it /etc/profile OR /etc/profile.d/ Or ~/.bash_profile etc?
Sorry, I guess I don't understand. If you know the answer why are you asking the question. Your first question was "What is the appropriate location for this scala..." I answered that question. I have no idea how your company works.
Your second question was "Where should I enter this environmental variable so that they are persistent even after reboot." I gave you an answer to that question. Putting it in the files I suggested will make them persistent even after reboot.
Please clarify what exactly you want to know. I have absolutely no idea.