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






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






3. _________ in perl - An associative array






4. Arrays can be assigned or read in _________






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






6. Removes the last element from the array pop






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






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






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






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






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






12. 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






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






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






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






16. To write to a filehandle






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






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






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






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






21. In arrays elements need not be __________






22. Returns the length of the string including escape sequences






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






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






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






26. 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






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






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






29. Does the hash key with "keyName" exists






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






31. 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






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






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






34. Sort and array alphabetically






35. Reverses the elements of the array






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






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






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






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






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






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






42. Removes trailing newline






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






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






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






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






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






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






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






50. To include modules in perl






Can you answer 50 questions in 15 minutes?



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