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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. Assignment of a hash variable for a single hash element






3. Reverses the elements of the array






4. < - > - == - <= - >= - !=






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






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






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






8. Split string into an array using spaces as delimeter






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






10. Removes the last element from the array pop






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






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






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






14. To write to a filehandle






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






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






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






18. Does the hash key with "keyName" exists






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






20. Delete the hash entry with the key given






21. 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






22. Arrays can be assigned or read in _________






23. Removes the first element of the array shift






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






25. Removes trailing newline






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






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






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






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






30. To include modules in perl






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






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






33. 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






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






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






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






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






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






39. Sort and array alphabetically






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






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






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






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






44. Remove trailing newline from each element in the array






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






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






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






48. 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






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






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






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