MIAOU-BASH is a collection of settings and helpers for leveraging BASH. Developer-friendly, it may be used as solo package with or without the miaou project.
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#!/bin/bash
echo >&2 "time elapsed in seconds..."
START=$(date +%s.%N)
# do something #######################
$@
#######################################
END=$(date +%s.%N)
DIFF=$(echo "scale=2; (${END} - ${START}) / 1" | bc)
echo "${DIFF}"