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






2. Sort and array alphabetically






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






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






5. To write to a filehandle






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






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






8. 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






9. Removes the first element of the array shift






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






11. < - > - == - <= - >= - !=






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






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






14. Delete the hash entry with the key given






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






16. Removes the last element from the array pop






17. 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






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






19. Does the hash key with "keyName" exists






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






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






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






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






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






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






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






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






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






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






30. Remove trailing newline from each element in the array






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






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






33. Returns the length of the string including escape sequences






34. To include modules in perl






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






36. 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






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






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






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


40. Arrays can be assigned or read in _________






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






42. In arrays elements need not be __________






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






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






45. Removes trailing newline






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






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






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






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






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