how to set path permanently in linux

Hello,

Depending on the shell you are running (probably bash) you set the path in your .bash_profile file. The file is in your home directory and you can add to the entries there:

# User specific environment and startup programs

PATH=$PATH:$HOME/bin

export PATH

Or just:

export PATH=$HOME/bin:/usr/local/bin:${PATH}

This gives precidence to executable files in your personal bin directory, then to those in /usr/local/bin, and finally to the default PATH environment. Note the {} around PATH. That allows a recursive path definition like this, especially if the existing PATH environment is complexly defined. It is safer than not useing the curly braces.