PSコマンドでもいいけど $ perl -lpe ' s/\000/ /g;' /proc/*/cmdline

$ time find .... -type d | sed -e 's!....!!' | wc -l 2744 real 0m36.719s user 0m0.922s sys 0m15.812s $ time find .... -type d | sed -e 's!....!!' | xargs mkdir real 0m21.031s user 0m1.172s sys 0m18.750s

$ time find . | wc -l 40397 real 1m23.109s user 0m3.110s sys 1m8.468s $ time rm -rf * real 1m46.906s user 0m3.531s sys 1m37.422s

32436 ディレクトリを real 0m55.125s user 0m2.437s sys 0m24.937s で，作成．