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






2. Does the hash key with "keyName" exists






3. 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






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






5. Delete the hash entry with the key given






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






7. Removes the first element of the array shift






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






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






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






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






12. 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






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






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






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






16. In arrays elements need not be __________






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






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






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






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


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






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






23. Removes trailing newline






24. To write to a filehandle






25. Remove trailing newline from each element in the array






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






27. _________ in perl - An associative array






28. Arrays can be assigned or read in _________






29. Split string into an array using spaces as delimeter






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






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






32. < - > - == - <= - >= - !=






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






34. To include modules in perl






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






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






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






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






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






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






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






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






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






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






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






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






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






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






49. Reverses the elements of the array






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