If you create a shell script, and you don’t want to run it with the whole url such as /full/path/to/your/file.sh you can do the following:

• Create a symlink to the corresponding script in folder /usr/local/bin
  
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  # Create the corresponding symlink sudo ln -s /full/path/to/your/file.sh /usr/local/bin/name_of_new_command # After that you should make your file executable: chmod +x /full/path/to/your/file.sh

• Now you should be able to run name_of_new_command at any time in your terminal.