I've heard this many times, and I don't really understand the argument. I've used the shell plenty of times for this sort of work, but it's much more complicated to do certain things correctly than in an IDE. Things like looping over any filename, escaping arbitrary strings for use within sed patterns, xargs, multi-line replacements and regex lookahead require quite some in-depth knowledge, trial and error, and sometimes installing special tools because the defaults don't support the relevant patterns (like path NUL terminators or lookaheads). I don't have to deal with any of these in IDEA.
Of course it requires knowledge, but the point is that when you have that knowledge, it transfers to other things as well, making you far more capable in many more situations.
