(command.CommandList children: [ (C {<'/usr/bin/echo'>}) (C {<'/usr/bin/date'>}) (command.Pipeline children: [ (C {<'/usr/bin/cat'>} {<-sv>} { (command_sub left_token: <Id.Left_Backtick '`'> child: (command.Simple words: [{<'/usr/bin/ls'>} {<-tr1>} {<'/var/adm/messages.'> <Id.Lit_QMark '?'>}] redirects: [ (redir op: <Id.Redir_Great '2>'> loc: (redir_loc.Fd fd:2) arg: {<'/dev/null'>} ) ] more_env: [] do_fork: T ) right: <Id.Backtick_Right '`'> ) } {<'/var/adm/messages'>} ) (C {<'/usr/bin/tail'>} {<-200>}) ] negated: F stderr_indices: [] ) ] )