Setting an argument with bash [duplicate]

Answer 1

It might be a bash issue with word splitting on space:

Try:

#!/bin/bash

IFS=$'\n'

INSTALL_CMD=rpm
INSTALL_OPT='-Uvh'
INSTALL_OPT_DEFINE='--define _transaction_color 3'

${INSTALL_CMD} ${INSTALL_OPT} ${INSTALL_OPT_DEFINE} myPackage.rpm