atime

# Return $command average run time
#!/bin/bash
set -euo pipefail

# Check if GNU time is installed
if ! command -v time >/dev/null 2>&1 ; then 
	echo "GNU time is required, please install it" 1>&2
	exit 1
fi

function usage {
    printf "Usage: %s [OPTIONS] COMMAND\n" "$(basename $0)" 1>&2 
    printf "Return COMMAND average run time.\n"
    printf "\tOptions:\n"
    printf "\t-n NUM\t\tRun given command N times (max 100)\n"
    exit 2
}

function check_args {
    optstring=":hn:"
    while getopts ${optstring} arg; do
        case "${arg}" in
            h)
                usage
                ;;
            n)
                if [[ ${OPTARG} < 0 || ${OPTARG} > 100 ]]; then
                    echo "$0: arguments $OPTARG accepts an integer between 1 and 100" >&2
                    exit 3
                fi
                REPS="${OPTARG}"
		        ;;
            :)
                echo "$0: Must supply an argument to -$OPTARG." >&2
                exit 4
                ;;
            ?)
                echo "Invalid option: -${OPTARG}." >&2
                exit 5
                ;;
            *)
                echo "Unknown error occurred" >&2
                exit 6
                ;;
        esac
    done
}

# Check if 0 arguments were given
if [[ ${#} -eq 0 ]]; then
   usage
fi

# Check command-line arguments
check_args "$@"

# Default repetitions
REPS=20
TOT=0

for i in $(seq 1 $REPS); do
    TIME=$( (/usr/bin/TIME -f %e $1 > /dev/null) 2>&1 )
    TOT=$(echo $TIME + $TOT | bc -l)
done 

TOT=$(echo "scale=4; $tottime / $REPS" | bc -l)
printf "Average: %s seconds\n" "$TOT"