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






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






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






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






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






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






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






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






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






11. To write to a filehandle






12. Does the hash key with "keyName" exists






13. To include modules in perl






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






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






16. In arrays elements need not be __________






17. Split string into an array using spaces as delimeter






18. < - > - == - <= - >= - !=






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






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






21. _________ in perl - An associative array






22. Reverses the elements of the array






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






24. 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






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






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






27. Removes trailing newline






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






29. Returns the length of the string including escape sequences






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


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






32. Removes the last element from the array pop






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






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






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






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






39. Delete the hash entry with the key given






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






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






42. 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






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






44. Remove trailing newline from each element in the array






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






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






47. 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






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






49. Sort and array alphabetically






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