I needed this for a project and it has served me pretty well. Let's jump right into it:
# This is elapsed.sh
SECONDS=0
function elapsed()
{
local T=$SECONDS
local D=$((T/60/60/24))
local H=$((T/60/60%24))
local M=$((T/60%60))
local S=$((T%60))
(( $D > 0 )) && printf '%d days ' $D
(( $H > 0 )) && printf '%d hours ' $H
(( $M > 0 )) && printf '%d minutes ' $M
(( $D > 0 || $H > 0 || $M > 0 )) && printf 'and '
printf '%d seconds\n' $S
}
And here's how you use it:
# Assume elapsed.sh to be in the current working directory
source elapsed.sh
echo "Doing some stuff..."
# Imagine it does something slow that
# takes about 3 seconds to complete.
sleep 3
elapsed
echo "Some quick stuff..."
sleep 1
elapsed
echo "Doing some slow stuff..."
sleep 61
elapsed
The output of running that is:
Doing some stuff... 3 seconds Some quick stuff... 4 seconds Doing some slow stuff... 1 minutes and 5 seconds
Basically, if you have a bash script that does a bunch of slow things, it having a like of elapsed there after some blocks of code will print out how long the script has been running.
It's not beautiful but it works.
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