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. 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






2. Removes the last element from the array pop






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






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. To write to a filehandle






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






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






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






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






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






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






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






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






14. Reverses the elements of the array






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






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






17. 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






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






19. _________ in perl - An associative array






20. < - > - == - <= - >= - !=






21. Split string into an array using spaces as delimeter






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






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


24. Arrays can be assigned or read in _________






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






26. Does the hash key with "keyName" exists






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






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






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






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






31. Removes the first element of the array shift






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






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






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






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






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






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






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






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






40. Sort and array alphabetically






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






42. 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






43. To include modules in perl






44. Remove trailing newline from each element in the array






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






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






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






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






49. Returns the length of the string including escape sequences






50. In arrays elements need not be __________