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






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






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






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






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






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






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






9. Does the hash key with "keyName" exists






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






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






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






13. To write to a filehandle






14. Returns the length of the string including escape sequences






15. Split string into an array using spaces as delimeter






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






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






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






19. Arrays can be assigned or read in _________






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






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






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






23. Removes trailing newline






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






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






26. Sort and array alphabetically






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






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






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






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






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






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






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






34. Reverses the elements of the array






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






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






37. Removes the last element from the array pop






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






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






40. Delete the hash entry with the key given






41. In arrays elements need not be __________






42. _________ in perl - An associative array






43. < - > - == - <= - >= - !=






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






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






46. To include modules in perl






47. 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






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






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






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