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






2. Removes the first element of the array shift






3. 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






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






5. < - > - == - <= - >= - !=






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






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






8. Arrays can be assigned or read in _________






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






10. Removes trailing newline






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






12. Returns the length of the string including escape sequences






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






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






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






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






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






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






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






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






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






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






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






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. To write to a filehandle






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






27. Removes the last element from the array pop






28. To include modules in perl






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






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






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






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






33. Sort and array alphabetically






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






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






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






37. Does the hash key with "keyName" exists






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






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






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






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






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






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






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






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






46. 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






47. Remove trailing newline from each element in the array






48. Delete the hash entry with the key given






49. 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






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