É um teste de loop em diferentes funções afim de verificar a performance de cada.

branchmark-function-of-loop.sh

#!/usr/bin/env bash
echo """
##################################################
Verificação de varias chamadas a mesma funcao
"""
loopado='Sou mais rápido!'

function echoLoop (){
	for a in `seq 1024`
	do
					echo "$loopado" > /dev/null
	done
}

function prinLoop (){
	for b in `seq 1024`
	do
					printf "$loopado" > /dev/null
	done
}

function prinThereLoop (){
	for c in `seq 1024`
	do
					printf "$loopado" > /dev/stdout > /dev/null
	done
}
function catLoop (){
	for d in `seq 1024`
	do
					cat <<- EOF > /dev/null
					$loopado
					EOF
	done
}

echo -e "--------------------------------------------------\n### PRINTF ###"
time prinLoop

echo -e "--------------------------------------------------\n### ECHO ###"
time echoLoop 

echo -e "--------------------------------------------------\n### printf > /dev/stdout ###"
time prinThereLoop

echo -e "--------------------------------------------------\n### CAT ###"
time catLoop