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. A special system variable used to pass arguments to script






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






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






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






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






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






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






8. Sort and array alphabetically






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






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






11. Regular __________: * - 0 or more characters - + - 1 or more characters - ? - 0 or 1 characters






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






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






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






15. Remove trailing newline from each element in the array






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






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






18. _________ in perl - An associative array






19. Split string into an array using spaces as delimeter






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






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






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






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






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






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






26. Delete the hash entry with the key given






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






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






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






30. In arrays elements need not be __________






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






32. Removes the last element from the array pop






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






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






35. Reverses the elements of the array






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






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






38. To write to a filehandle






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






40. Does the hash key with "keyName" exists






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






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






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






44. 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






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






46. Returns the length of the string including escape sequences






47. Arrays can be assigned or read in _________






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






49. Removes the first element of the array shift






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

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