CS 497C - Homework 8 - Name:_________________

    1. You are afraid that you may accidently overwrite files with > symbol.
       What precaution will you take?

  Ans: Make the setting set -o noclobber (bash or Korn) or set noclobber
       (C shell).

    2. When does a shell variable become an environment variable?
 
  Ans: When it is made available to all sub-shells with the export command or 
       defined with the setenv statement (C shell).
    
    3. How will you repeat the last command in the (i) C shell (ii) Korn
       (iii) bash?

  Ans: (i) !! (ii) r (iii) !!
    
    4. If you have set noclobber to prevent overwriting, how will you
       overwrite files when you really need to in the (i) C shell (ii) Korn 
       and bash?

 Ans: Instead of >, use (i) >! (ii) >|.

    5. If you have kept all your aliases in the file .alias in your home
       directory, how can you ensure that they are available in all sub-shells 
       of the (i) C shell (ii) Korn (iii) bash?

 Ans: Place this command in the respective environment file:
      (i) source ~/.alias
      (ii) . ~/.alias
      (iii) source ~/.alias