When to learn the command line version of a programming tool?

Posted by explorest on Programmers See other posts from Programmers or by explorest
Published on 2011-02-05T17:42:43Z Indexed on 2012/04/02 23:41 UTC
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command-line

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 of 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

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