perf.sh

#!/usr/bin/zsh

SHELL=/usr/bin/zsh


do_perf () {
    printf "Going to run: %s\n" "$1"
    for i in {1..5}; do
        time $SHELL -c "$1"
    done
    printf "\n"
}

# cache stuff:
find /usr -name "*c*" -exec cat {} \; >/dev/null 2>&1

do_perf('find /usr -name "*c*" -type f -exec cat {} \; | wc -l')
do_perf('find /usr -name "*c*" -type f -exec cat {} + | wc -l')
do_perf('find /usr -name "*c*" -type f -print0 | xargs -0 cat | wc -l')
do_perf('for i in /usr/**/*c*(.); do cat $i; done | wc -l')

./perf.sh:17: invalid mode specification