osx - Mass replace characters in filenames from terminal? -

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i have 50 files in directory contain spaces, apostrophes, etc. how can go mass-renaming them remove apostrophes , replaces spaces underscores?

i can 

ls | grep '*.txt' | xargs ....

but i'm not sure in xargs bit

i use ren-regexp, perl script lets mass-rename files easily.

you'd ren-regexp 's/ /_/g' *.txt.

$ ls -l total 16 -rw-r--r--  1 marc  marc  7 apr 11 21:18 that's wrap.txt -rw-r--r--  1 marc  marc  6 apr 11 21:18 what's time.txt  $ ren-regexp "s/\'//g" "s/ /_/g" *.txt    that's wrap.txt 1 thats wrap.txt 2 thats_a_wrap.txt    what's time.txt 1 whats time.txt 2 whats_the_time.txt   $ ls -l total 16 -rw-r--r--  1 marc  marc  7 apr 11 21:18 thats_a_wrap.txt -rw-r--r--  1 marc  marc  6 apr 11 21:18 whats_the_time.txt

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