I've recently installed the ConTeXt standalone following the instructions
listed below:

https://www.contextgarden.net/Ubuntu

However, commands as "context" and "mtxrun" only work when executed from
terminal. When I specify these commands in a text editor (TeXstudio,
Textadept), they just don't work, even with a full path specified. On the
contrary, commands as "tex" or "latex" from TeX Live are visible to
editors. How to fix that?