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Perl Programming

Subject : it-skills
Instructions:
  • Answer 50 questions in 30 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. A special system variable used to pass arguments to script






2. Stores information about the current users environment. You can print this from the command line using printenv






3. Removes trailing newline






4. In arrays elements need not be __________






5. The variable that provides the last index of an array






6. The four types of loops in perl: while - until - for - ________






7. Arrays can be assigned or read in _________






8. To get rid of the ________ in $line you could now chomp() (Ex: chomp($line);)






9. The purpose of {} in an "if" statement: To Define the __________ of the if statement. Unlike C the {} braces ARE REQUIRED






10. eq - ne - lt - le - gt - ge






11. The __________ in perl: - uses grave marks `command args`- returns the output of the command to the variable you specify - if $output = `command arg` the output is stored all in one variable (all lines seperated by n) - if @output = `command arg` the






12. Assignment of hash variables in perl (when oringally defining the hash)






13. Two ____________ in regular expressions: =~ Contains - !~ Does not contain






14. Swap keys for values and values for keys. Will cause issues if there are multiple hash entries with the same value






15. Common ________: keys(%hash) - values(%hash) - each(%hash) - delete($hash{keyName}) - exists($hash{keyName}) - reverse(%hash)






16. Removes the first element of the array shift






17. $#arrayName returns the value of the ______ of the array (NOT the data stored in that array element)






18. Delete the hash entry with the key given






19. < - > - == - <= - >= - !=






20. Returns the sub string starting at index $startindex and ending after $numchars chars in the string $string






21. _________ $#arrayName give value of last index available in the array. Ex an array of size 5 will have its $#arrayName = 4






22. Returns a copy of the string as all upper case






23. Sort and array alphabetically






24. Returns a copy of the string with the first letter upper case






25. Join the elements of the array seperating the elements with the ':' character


26. Reverses the elements of the array






27. To include modules in perl






28. _________ in perl - An associative array






29. The three basic ________ of the open() function: > write - >> append - < read file






30. Returns a copy of the string with the first letter lower case






31. Common ________: pop(@array) - push(@array, $new Value) - shift(@array) - unshift(@array, $newValue) - sort(@array) - reverse(@array)






32. _________ of scalar variables in perl - using "=" - Ex: $myVariable = 5;






33. scalar(@arrayName) returns the ______ of the array names






34. Adds a new element to end of the array with value $newValue






35. Does the hash key with "keyName" exists






36. To read an entire file into an array (one line per element)






37. Common ___________: substr($string, $start, $numchars); - length($string) - lc($string) - uc($string) - chomp($string) - chomp(@string) - join(':", @string) - split(/\s/, $string) - lcfirst($string) - ucfirst($string)






38. ________ in perl - A collection of data (static data or scalar variables or arrays or hashes can all be stored in an array element)






39. The two phases of creating a PERL program _______ - Execution






40. Split string into an array using spaces as delimeter






41. ________ in perl - can be scalar array or hash context - tells the interpreter what you are looking for (Ex: "$arrayname[$index_number]")






42. The _______ in perl: - used to execute an external command - will output results of command to terminal - returns the exit status of the program that ran - use this for commands that you dont care about SAVING the output to a variable






43. _________ @arrayName) returns the size of the array






44. To write to a filehandle






45. Removes the last element from the array pop






46. Returns all of the keys of the hash as an array






47. Explain how to read a line from a file handle






48. Returns all of the values of the hash as an array






49. Returns the length of the string including escape sequences






50. The two primary methods of executing _______ in perl: - system("command args") - - `command args`






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