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






2. Removes trailing newline






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






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






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






6. To include modules in perl






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






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






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






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






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






12. To write to a filehandle






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






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






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


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






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






18. Removes the last element from the array pop






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






20. Returns the length of the string including escape sequences






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






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






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






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






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






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






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






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






29. Removes the first element of the array shift






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






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






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






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






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






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






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






37. _________ in perl - An associative array






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






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






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. Arrays can be assigned or read in _________






42. Remove trailing newline from each element in the array






43. 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






44. Reverses the elements of the array






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






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






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






48. Does the hash key with "keyName" exists






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






50. In arrays elements need not be __________