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






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






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






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






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






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






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






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






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






10. Removes the last element from the array pop






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






12. 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






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






14. Removes trailing newline






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






16. To write to a filehandle






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






18. Delete the hash entry with the key given






19. Split string into an array using spaces as delimeter






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






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






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

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






24. In arrays elements need not be __________






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






26. Remove trailing newline from each element in the array






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






28. Returns the length of the string including escape sequences






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






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






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






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






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






34. Arrays can be assigned or read in _________






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






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






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






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






39. Removes the first element of the array shift






40. < - > - == - <= - >= - !=






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






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






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






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






45. Does the hash key with "keyName" exists






46. Reverses the elements of the array






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






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






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






50. 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