hi, the default shell of my unix is csh. Now I want to set JAVA_HOME environment variables at root. I have many doubts about this.
1. setting JAVA_HOME for root, will it be different from JAVA_HOME variable of other users?
2. if in some file JAVA_HOME is already set, then setting it again will replace older value?
3. is it set in .cshrc file in home directory of any user for a c shell?
4. What are the commands to set?
5. if set in cshell, do i have to reset the variable for other shells also like bash?

I am a noob here as my doubts signify, but it will be great to have them resolved! Thank you in advance.

see here: https://www.ccs.uky.edu/docs/cluster/env.html
or http://www.darkmist.net/~schallee/un...ial/unix7.html
or http://www.gnu.org/software/libc/man...Variables.html
or see the man page of csh

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1. Setting JAVA_HOME for root, will it be different from JAVA_HOME variable of other users?
No, if everyone's using same path. JAVE_HOME variable carries full path where jave is installed. For a single system it should be same.

2. If in some file JAVA_HOME is already set, then setting it again will replace older value?
Yes, it will.

3. Is it set in .cshrc file in home directory of any user for a c shell?
Depends. It can be set in .cshrc if you're using c shell.

4. What are the commands to set?
For c shell it can be set using:
5. If set in c shell, do i have to reset the variable for other shells also like bash?
Yes, for every different sheell, you'll once need to set it. For bash, set it in .bashrc or in .bash_profile, as:-

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Thank you very much. I have figured it out now!

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