Test your basic knowledge |

Perl Programming

Subject : it-skills
Instructions:
  • Answer 50 questions in 30 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. eq - ne - lt - le - gt - ge






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






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






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






7. _________ in perl - An associative array






8. Removes the first element of the array shift






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






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






11. 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






12. Split string into an array using spaces as delimeter






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






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






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






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






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






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






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






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






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






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






23. < - > - == - <= - >= - !=






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






25. Removes the last element from the array pop






26. To write to a filehandle






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






28. Does the hash key with "keyName" exists






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






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






31. Delete the hash entry with the key given






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






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






34. Arrays can be assigned or read in _________






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






36. Remove trailing newline from each element in the array






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






38. 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






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






40. Reverses the elements of the array






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






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






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






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






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






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






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






48. Sort and array alphabetically






49. In arrays elements need not be __________






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