Although Radu's answer is absolutely correct, I feel like it's a bit incomplete for the beginner that does not know the location of certain files, so here's a step-by-step on the second method (using ~/bin). If you would like to store the files somewhere else than ~/bin, follow step 1, otherwise, ignore it and keep in mind you'll be using ~/bin as your scripts folders.

1. Open a terminal and run the following:

   
   
   

   nano .profile
   
   

   
   
   

   You should see, at the end of the file:

   
   
   

   # set PATH so it includes user's private bin if it exists
   
   if [ -d "$HOME/bin" ] ; then
   
       PATH="$HOME/bin:$PATH"
   
   fi
   
   

   
   
   

   If you don't see it, try using nano .bash_profile instead. Keep in mind you should be at ~/, that is, /home/YOUR_USERNAME

   
   
   

   This tells bash where user's scripts are. The default is /home/YOUR_USERNAME/bin which is "abbreviated" as $HOME/bin or ~/bin. You can then change it to any folder you'd like to store your scripts in. Mine is ~/.bin -- the same as the original, but hidden.




2. If you already issued chmod +x script.sh just move your scripts to the folder in which you're going to store them - create it if it doesn't exist. Inside that folder, if you store your scripts as file.sh you'll have to run file.sh everytime, so store them as file -- no extensions.