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rename
BASH + Utils 64(rename is the Perl script on Debian and derivatives, not the util-linux command.)
find . -depth -name "* *" -execdir rename 'y/ /_/' * \;
Edited for folder-depth, didn't read properly
BASH + Utils 64
(rename is the Perl script on Debian and derivatives, not the util-linux command.)
BASH + Utils 6064
BASH + Utils 60
find . -depth -name "* *" -execdir rename 'y/ /_/' *