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I just installed from Microchip website, and at the end it asked me

==> NOTE: You may wish to add the following  
   to your PATH environment variable.  

What does it mean?

I also need to add this to the environment path:

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PATH is a global operating system variable that contains names of files that are to be executed without specyfing the whole path to them. For example You can just write startx to start graphic environemnt instead of /bin/some other folders/startx – Misery May 24 '12 at 15:56
After editing .profile restart your system to get the changes to take effect. (Perhaps there is a way around this, but restarting certainly works) – thn May 30 '13 at 8:42
Run . ~/.profile for changes to take immediate effect – beam022 Sep 16 '15 at 11:48
up vote 43 down vote accepted

Partial duplicate: How to add a directory to my path?

PATH is an enviroment variable. Basically, it tells your machine were to search for programs, so when you run your picc program, you can just do this:


instead of


To add a directory to your $PATH, follow any one of the below.

  1. simply edit ~/.profile

    gedit ~/.profile

    find the following line:


    and change it to:

  2. Run the below command in terminal

    export PATH=$PATH:/usr/hitech/picc/9.82/bin
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i do not clearly understand what do i edited /etc/profile but the link in your answer says something like this if [ -d "$HOME/bin" ] ; then PATH="$PATH:$HOME/bin" fi what do do with this? – ths May 24 '12 at 16:09
There you go. I updated the answer. – reverendj1 May 24 '12 at 16:18
what to do if i need to add more than 1 path? – ths May 24 '12 at 16:32
Just keep adding a colon, then your new path to that string. i.e. PATH="$HOME/bin:$PATH:/usr/hitech/picc/9.82/bin:/my/new/path" – reverendj1 May 24 '12 at 16:37

Shell environment variables are used for several purposes, from storing data, storing software configurations, set terminal settings, and changing shell environment. The environment variables are normally set at boot time, or by different software as required. One way of setting environmental variables is from the command line.

List all variables on terminal


this will print all the variable that you have

Show one variable at a time

The amount of these variables can become a very long list and locating one specific variable can become a tough task. Fortunately Linux allows us to display the value of one shell variable by using the echo command along with the name of the variable. This makes the task very easy. example: echo "$HOME"

Add or change a variable

To add or modify an environment variable, we can use the export command followed by the name of the variable and the values that go with it.

export NameofVariable='value'

Note, however, that this will only work for the current shell session. It won't be available in any other terminals.

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Hi there, great first answer! Oh, and welcome to Ask Ubuntu! – grooveplex Jul 4 at 13:31

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