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






3. Remove trailing newline from each element in the array






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






5. To include modules in perl






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






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






8. Arrays can be assigned or read in _________






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






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






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






12. Returns the length of the string including escape sequences






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






14. 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






15. Removes the first element of the array shift






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






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






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






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






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






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


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






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






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






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






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






27. Sort and array alphabetically






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






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






30. _________ in perl - An associative array






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






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






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






34. Split string into an array using spaces as delimeter






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






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






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






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






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






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






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






42. < - > - == - <= - >= - !=






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






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






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






46. Removes trailing newline






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






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






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






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