Generaliza uso del binario de grep

		docker stack ls > /dev/null 2> /dev/null ; \

		if [ \"\${?}\" -eq \"0\" ] ; \

		then \

			SWARM_MODE=true ; \

			swarmMode=true ; \

		fi ; \

		if ls /usr/bin/grep > /dev/null 2> /dev/null ; \

		then \

			grepBin=/usr/bin/grep ; \

		else \

			grepBin=grep ; \

		fi ; \

		hits=0 && \

		for i in \$(seq 1 ${STATUS_CHECK_RETRIES}) ; \

		do \

			echo -e \"  try \${i}/${STATUS_CHECK_RETRIES} .. \\c\" && \

			if [ \"\${SWARM_MODE}\" = true ] ; \

			if [ \"\${swarmMode}\" = true ] ; \

			then \

				stackServices=\$(docker service ls -f name=${serviceToCheck} --format '{{.Replicas}}') ; \

				serviceCount=\$(echo \"\${stackServices}\" | /usr/bin/grep -cE '.+') ; \

				runningServiceCount=\$(echo \"\${stackServices}\" | /usr/bin/grep -cE '([0-9]+)\/\1') ; \

				serviceCount=\$(echo \"\${stackServices}\" | \${grepBin} -cE '.+') ; \

				runningServiceCount=\$(echo \"\${stackServices}\" | \${grepBin} -cE '([0-9]+)\/\1') ; \

				statusCheckCmd=\"[ \"\${serviceCount}\" -ne \"0\" -a \

					\"\${serviceCount:-_}\" = \"\${runningServiceCount:--}\" ]\" ; \

			else \

				runningContainersIds=\$(docker ps -f status=running --format '{{.ID}}' --no-trunc) ; \

				successfullyExitedContainersIds=\$(docker ps -a -f exited=0 --format '{{.ID}}' --no-trunc) ; \

				serviceContainerId=\$(docker inspect --format='{{.ID}}' ${serviceToCheck} 2> /dev/null) ; \

				runningService=\$(echo \"\${runningContainersIds}\" | grep \"\${serviceContainerId:--}\") ; \

				runningService=\$(echo \"\${runningContainersIds}\" | \${grepBin} \"\${serviceContainerId:--}\") ; \

				successfullyExitedService=\$(echo \"\${successfullyExitedContainersIds}\" | \

					grep \"\${serviceContainerId:--}\") ; \

					\${grepBin} \"\${serviceContainerId:--}\") ; \

				statusCheckCmd=\"[ \${serviceContainerId:-_} = \${runningService:--} -o \

					\${serviceContainerId:-_} = \${successfullyExitedService:--} ]\" ; \

			fi ; \