Each action performed in IDRISI can be performed using a command line documented in the help of each function. The last figure I showed shows how to create a command related to making a composition. All these command lines can be gathered in a file, that IDRISI can interpret to perform them.
No. Moreover, now merged into TerrSet software, price increased a lot. In addition, it does not support Linux so it is barely never used in research.
All of them 