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. Regular __________: * - 0 or more characters - + - 1 or more characters - ? - 0 or 1 characters






2. In arrays elements need not be __________






3. Split string into an array using spaces as delimeter






4. 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






5. Sort and array alphabetically






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






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






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






9. < - > - == - <= - >= - !=






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






11. Delete the hash entry with the key given






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






13. To include modules in perl






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






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






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






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






18. The open() statement in perl: open(________, file_mode, "filename.txt")






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






20. 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






21. Removes trailing newline






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






23. The use of ______ in perl - Documenting code - Created by placing a "#" on a line. - are not multi-line






24. Add a new element to the from of the array with the value $newwValue






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






26. Removes the first element of the array shift






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






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






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






30. Regular ____________: w - alphanumeric word including underscor - d - digits 0-9 - s any whitespace - . - any character






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






32. Returns the length of the string including escape sequences






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






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






35. 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






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






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






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






39. Reverses the elements of the array






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






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






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






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






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






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






46. Remove trailing newline from each element in the array






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






48. Removes the last element from the array pop






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






50. Arrays can be assigned or read in _________