Shell Get 'microtime(TRUE)'

microtime.sh

#!/bin/bash

DEFAULT_SCALE=4

getMicrotime ()
{
    date +%s%N
}

microElapse ()
{
    local microTimeA=$1
    local microTimeB=$2
    local scale=${3:-${DEFAULT_SCALE}}
    
    echo "scale=${scale}; ${microTimeB}-${microTimeA}" | bc -l
}

microElapseToSecs ()
{
    local microTimeA=$1
    local microTimeB=$2
    local scale=${3:-${DEFAULT_SCALE}}
    
    echo "scale=${scale}; $(microElapse ${microTimeA} ${microTimeB} ${scale})/1000000000" | bc -l
}

echo -e "\t###"
echo -e "\t# Example"
echo -e "\t###"

a=$(getMicrotime)
echo "a: '${a}'"
sleep 1
b=$(getMicrotime)
echo "b '${b}'"
elapsed=$(microElapseToSecs ${a} ${b})
echo "========================"

echo -e "elapsed(u):\t'$(microElapse ${a} ${b})'"
echo -e "elapsed(s):\t'$(microElapseToSecs ${a} ${b})'"