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 _______ 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






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






4. 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






5. To include modules in perl






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






7. 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






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






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






10. Sort and array alphabetically






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






12. Removes trailing newline






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






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






15. Does the hash key with "keyName" exists






16. Returns the length of the string including escape sequences






17. Delete the hash entry with the key given






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






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






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






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






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






23. Arrays can be assigned or read in _________






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






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






26. To write to a filehandle






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






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






29. Removes the last element from the array pop






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






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






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






33. Remove trailing newline from each element in the array






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






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






36. _________ in perl - An associative array






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






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






39. Split string into an array using spaces as delimeter






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






41. Reverses the elements of the array






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






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






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






45. In arrays elements need not be __________






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






47. < - > - == - <= - >= - !=






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


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






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