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






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






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






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






5. Delete the hash entry with the key given






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






7. 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






8. Removes the last element from the array pop






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






10. Removes trailing newline






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






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






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






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






15. Removes the first element of the array shift






16. _________ in perl - An associative array






17. Sort and array alphabetically






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






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






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






21. To include modules in perl






22. Split string into an array using spaces as delimeter






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






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






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






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






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






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. To write to a filehandle






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






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






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






33. 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






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






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






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






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






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






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






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






41. Remove trailing newline from each element in the array






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


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






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






46. In arrays elements need not be __________






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






48. Reverses the elements of the array






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






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