SHELL_SCRIPT
  COMMANDS_LIST
    SIMPLE_COMMAND
      GENERIC_COMMAND_DIRECTIVE
        LITERAL
          PsiElement(word)('echo')
      PsiWhiteSpace(' ')
      LITERAL
        PsiElement(word)('a')
      PsiWhiteSpace(' ')
      SIMPLE_COMMAND_ELEMENT
        REDIRECTION
          PsiElement(>>)('>>')
          PsiWhiteSpace(' ')
          PsiElement(word)('out')
      PsiWhiteSpace(' ')
      LITERAL
        PsiElement(word)('c')