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 a copy of the string as all upper case






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






3. Does the hash key with "keyName" exists






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






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






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






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






8. Returns the length of the string including escape sequences






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






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






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






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






13. In arrays elements need not be __________






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






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






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






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






18. Remove trailing newline from each element in the array






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






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






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






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






23. Arrays can be assigned or read in _________






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

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25. To include modules in perl






26. 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






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






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






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






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






31. Removes trailing newline






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






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






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






36. < - > - == - <= - >= - !=






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






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






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






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






41. Delete the hash entry with the key given






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






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






44. _________ in perl - An associative array






45. 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






46. Split string into an array using spaces as delimeter






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






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






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






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