how to execute "cleartool lsbl" to generate a basline list from jenkins (installed in linux) with Extensible choice build parameter after selecting groovy script option ?

i am using below groovy snippet but it is not working :
def list = 'lsbl -stream <Strem>@/vob/<pvob> -short'.execute().text
list.eachLine{
println it
}

i need above customization as we have multiple baselines to mount from the selected baseline Any post to resolve above issue will be highly appreciated.