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. Removes trailing newline






2. To write to a filehandle






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






4. Removes the last element from the array pop






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






6. 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






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






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






9. Delete the hash entry with the key given






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






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






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






13. Sort and array alphabetically






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






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






16. Split string into an array using spaces as delimeter






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






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






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






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






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






22. 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






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






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






27. Does the hash key with "keyName" exists






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






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






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






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






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






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






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






35. In arrays elements need not be __________






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






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






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


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






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






41. Removes the first element of the array shift






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






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






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






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






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






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






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






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






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