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






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






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






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






5. 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






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






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






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






9. To write to a filehandle






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






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






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






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






14. Removes trailing newline






15. Sort and array alphabetically






16. Delete the hash entry with the key given






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






18. 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






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






20. 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






21. Split string into an array using spaces as delimeter






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






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






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






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






26. Remove trailing newline from each element in the array






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






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


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






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






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






32. < - > - == - <= - >= - !=






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






34. _________ in perl - An associative array






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






36. Does the hash key with "keyName" exists






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






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






39. Reverses the elements of the array






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






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






42. To include modules in perl






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






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






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






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






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






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






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






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






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