When to learn the command line version of a programming tool ?
- by explorest
Almost every programming tool has a command line version; many of which also have a gui version. It takes a lot of time and memorization effort to learn the different commands and various options/switches om the command line version. 
So  I have a couple of questions (which are not necessarily mutually exclusive): 
1) When would you bother learning/memorizing the commands in the command line version of a tool which also comes in a gui version ?  
2) What tools should I learn the command line version of ? .... compilers ?  version control system ? etc, etc