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. Delete the hash entry with the key given






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






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






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






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






7. Returns the length of the string including escape sequences






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






9. Sort and array alphabetically






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






11. Does the hash key with "keyName" exists






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






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






14. 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






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






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






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. Removes the first element of the array shift






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






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






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






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






24. To include modules in perl






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






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






27. Arrays can be assigned or read in _________






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






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






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






31. Reverses the elements of the array






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






33. Split string into an array using spaces as delimeter






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






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






36. 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






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






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






39. < - > - == - <= - >= - !=






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






41. To write to a filehandle






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






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






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






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






46. _________ in perl - An associative array






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






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






49. In arrays elements need not be __________






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