Execute a shell command from Groovy, print its output, and process non-zero exit status

ShellCommand.groovy

def cmdLine = args.join(' ')
def ps = cmdLine.execute()
ps.in.eachLine {
    println it
}

def status = ps.exitValue()
if (status) {
    println ps.err.text
    throw new IOException("$cmdLine returns $status")
}