(CommandList children: [ (C {(set)} {(-o)} {(errexit)}) (C {(set)} {(-o)} {(nounset)}) (C {(set)} {(-o)} {(pipefail)}) (AndOr children: [ (C {(grep)} {(SQ <"^hosts:.*myhostname">)} {(/etc/nsswitch.conf)}) (Subshell child: (C {(sed)} {(-e)} {(SQ <"s/^hosts:\\(.*\\)/hosts:\\1 myhostname/">)} {(-i)} {(/etc/nsswitch.conf)} ) spids: [79 94] ) ] op_id: Op_DPipe ) ] )