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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. Explain how to read a line from a file handle






2. Delete the hash entry with the key given






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






4. 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






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






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






7. Removes trailing newline






8. Arrays can be assigned or read in _________






9. Sort and array alphabetically






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






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






12. _________ in perl - An associative array






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






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






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






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






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






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






19. Removes the first element of the array shift






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






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






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






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






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






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






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






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






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






29. 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






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






31. Split string into an array using spaces as delimeter






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






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






34. Returns the length of the string including escape sequences






35. Reverses the elements of the array






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






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






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






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






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






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






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






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






44. Removes the last element from the array pop






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






46. In arrays elements need not be __________






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






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






49. Remove trailing newline from each element in the array






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






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