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






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






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






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






5. Sort and array alphabetically






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






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






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






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






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






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






12. Removes trailing newline






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






14. Arrays can be assigned or read in _________






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






16. < - > - == - <= - >= - !=






17. To write to a filehandle






18. Reverses the elements of the array






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






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






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






22. Delete the hash entry with the key given






23. In arrays elements need not be __________






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






25. 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






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






27. Removes the last element from the array pop






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






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






30. 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






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






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


33. Removes the first element of the array shift






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






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






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






37. Split string into an array using spaces as delimeter






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






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






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






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






42. Does the hash key with "keyName" exists






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






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






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






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






47. 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






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






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






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