Adding a directory to PATH in Ubuntu [closed]

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I am a new user of Linux, just switched from Windows. I installed ActiveTcl-8.5 in /opt/ActiveTcl-8.5/, now I want to add its bin directory to the UNIX path.

I have read a number of articles from the net and got confused about which开发者_Python百科 file to modify. My /home/tofayel directory contains .bashrc, .bash_logout, .bash_history, and .profile; but not .bash_login and .bash_profile.

Where do I add the extra lines to add /opt/ActiveTcl-8.5/bin to PATH?

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The file .bashrc is read when you start an interactive shell. This is the file that you should update. E.g:

export PATH=$PATH:/opt/ActiveTcl-8.5/bin

Restart the shell for the changes to take effect or source it, i.e.:

source .bashrc

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Actually I would advocate .profile if you need it to work from scripts, and in particular, scripts run by /bin/sh instead of Bash. If this is just for your own private interactive use, .bashrc is fine, though.

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you can set it in .bashrc

PATH=$PATH:/opt/ActiveTcl-8.5/bin;export PATH;