IT 244: Introduction to Linux/Unix
Quiz 9 Answers

  1. What does Bash do when it performs alias substitution? 
    it replaces the name of the alias with a Unix command
  2. Write the command you would use to create the files foo1.txt to foo5.txt using brace expansion and the touch command. 
    touch  foo{1,2,3,4,5}.txt
  3. What does Bash do when it performs tilde (~) expansion? 
    replaces ~ with the absolute address of your home directory 
or
replaces ~UNIX_USERNAME with the absolute address of the home directory of UNIX_USERNAME
  4. What would you write at the command line to define the alias ll whose value was ls -l ? 
    alias ll='ls -l'
  5. Can an alias be made global? 
    no
  6. Can a function be made global? 
    yes if export -f is used
  7. How is the command that follows if used to determine whether or not the statements between the then and fi keywords are executed? 
    if the command returns an exit status of 0 the statements are executed
  8. What does the test command do? 
    analyze a logical expression and return an exit status that 
tells whether the expression is true or false
  9. What is the value of the exit status returned by test to indicate that the expression is true? 
    0
  10. Does the command that follows if need to be test? 
    no, it can be any command that returns an exit status