newCmds := make([]*parse.CommandNode, pipelineLen, pipelineLen+len(s))
	insertedIdents := make(map[string]bool)
	for i := 0; i < pipelineLen; i++ {
		cmd := p.Cmds[i]
		newCmds[i] = cmd
		if idNode, ok := cmd.Args[0].(*parse.IdentifierNode); ok {
			insertedIdents[normalizeEscFn(idNode.Ident)] = true
		}
	}
	for _, name := range s {
		if !insertedIdents[normalizeEscFn(name)] {