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






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






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






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






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






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






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






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






9. Sort and array alphabetically






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






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






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






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






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






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






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






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






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






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






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






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






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






23. 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






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






25. 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






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






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






28. Reverses the elements of the array






29. Does the hash key with "keyName" exists






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






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






32. To include modules in perl






33. Split string into an array using spaces as delimeter






34. In arrays elements need not be __________






35. Delete the hash entry with the key given






36. Arrays can be assigned or read in _________






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






38. Removes trailing newline






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






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






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






42. 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






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






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






45. Removes the last element from the array pop






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






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






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






49. Returns the length of the string including escape sequences






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