(command.CommandList children: [ (command.If arms: [ (if_arm cond: [ (command.Sentence child: (C {(Lit_LBracket '[')} {(DQ ($ VSub_DollarName '$SSH_CLIENT'))} {(Lit_RBracket ']')}) terminator: <Op_Semi ';'> ) ] action: [ (command.ShAssignment pairs: [ (assign_pair lhs: (sh_lhs_expr.Name name:expression) op: Equal rhs: { (command_sub left_token: <Left_DollarParen '$('> command_list: (command.CommandList children: [ (command.Pipeline children: [ (C {(echo)} {(DQ ($ VSub_DollarName '$SSH_CLIENT'))}) (C {(sed)} { (SQ <'s/.*://;\n'> < ' s/^\\([0-9.]*\\) [0-9]* \\([0-9]*\\)$/not \\( host \\1 and port \\2 \\)/' > ) } ) ] negated: F ) ] ) ) } ) ] ) ] ) ] ) (C {(tcpdump)} {(DQ ($ VSub_At '$@'))} {($ VSub_DollarName '$expression')}) ] )