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. Removes the last element from the array pop






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






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






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






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






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






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






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






9. Remove trailing newline from each element in the array






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






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






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






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






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

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






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






17. Delete the hash entry with the key given






18. To write to a filehandle






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






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






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






22. Removes trailing newline






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






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






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






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






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






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






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






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






31. To include modules in perl






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






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






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






35. Sort and array alphabetically






36. In arrays elements need not be __________






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






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






39. 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






40. 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






41. Reverses the elements of the array






42. Returns the length of the string including escape sequences






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






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






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






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






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






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






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






50. 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