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Test your basic knowledge |

Perl Programming

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 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. Split string into an array using spaces as delimeter






2. A special system variable used to pass arguments to script






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






4. To write to a filehandle






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






6. 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






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






8. Returns the length of the string including escape sequences






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






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






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






12. Returns a two element ray of the next key value pair; resultArray[0] is the key resultArray[1] is the value






13. < - > - == - <= - >= - !=






14. 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






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






16. Modules in perl - Synonymous with header files in C - Collection of ______ and variables that may be used in your program






17. Removes the first element of the array shift






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






19. Reverses the elements of the array






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






21. Assignment of a hash variable for a single hash element






22. The use of "if" "if-else" and "if-elsif-else"






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






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






25. Remove trailing newline from each element in the array






26. In arrays elements need not be __________






27. Delete the hash entry with the key given






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






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






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






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






32. Does the hash key with "keyName" exists






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






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






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






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






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






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






39. Arrays can be assigned or read in _________






40. _________ in perl - An associative array






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


42. Removes the last element from the array pop






43. Sort and array alphabetically






44. In perl the _______ will recognize syntax errors and halt execution BEFORE it begins - and will output statements; it does not understand and the line which it encountered the error on






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






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






47. _________ in perl - Singular variable - starts with "$" - Number or characer or string- Perl does automatic type conversion of these






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






49. Returns a copy of the string as all lower case






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






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