General pattern: 
ls -1 | perl -nle'$o=$_; s///; $n=$_; rename($o,$n)if!-e$n'

[download]
As applied to your case: 
ls -1 *.avi | perl -nle'$o=$_; s/\[crap\]/Season1/; $n=$_; rename($o,$
+n)if!-e$n'

[download]

I find if!-e$n essential. One a couple of occasions, I've managed to delete all but one file in a directory without it.

There's a rename floating around script that takes regex patterns. That would be a better solution.

In reply to Re: one liner to rename multiple files in a directory? by ikegami
in thread one liner to rename multiple files in a directory? by VGR

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