Simple bash script to check execution time of given binary from CS50 Harvard University Lab #3

check-runtime-cs50-lab3.sh

#!/bin/bash
# Simple bash script to check execution time of given
# binary from CS50 Harvard University Lab #3
#
# Make sure you download correct .zip file, extract and
# place this script to ./sort directory. 
# Please see https://cs50.harvard.edu/x/2022/labs/3/ for
# more details.
#
# NOTE:
# You need Bash version 4.2 or above to run this script
# because lastpipe introduced since Bash 4.2

shopt -s lastpipe

binfile=(
    "./sort1"
    "./sort2"
    "./sort3"
)

for bin in "${binfile[@]}"
do
    echo "$bin"
    totalruntime=0;
    sortedtime=0;
    reversedtime=0;
    randomtime=0;
    find ./ -type f -name "*000.txt" -print0 | while read -d $'\0' file
    do
        start=`date +%s.%N`
        $bin $file > /dev/null 2>&1
        end=`date +%s.%N`
        runtime=$(echo "$end - $start" | bc -l)
        if [[ $file =~ .*sorted.* ]]; then
            sortedtime=$(echo "$sortedtime + $runtime" | bc -l)
        fi
        if [[ $file =~ .*reversed.* ]]; then
            reversedtime=$(echo "$reversedtime + $runtime" | bc -l)
        fi
        if [[ $file =~ .*random.* ]]; then
            randomtime=$(echo "$randomtime + $runtime" | bc -l)
        fi
        totalruntime=$(echo "$totalruntime + $runtime" | bc -l)
        echo "$runtime sec exec time for $file"
    done
    echo "---------------------------";
    echo "Sorted time:  : $sortedtime";
    echo "Reversed time : $reversedtime";
    echo "Random time:  : $randomtime";
    echo "Total runtime : $totalruntime";
    echo "---------------------------";
    echo "===========================";
done
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