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






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






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






4. Remove trailing newline from each element in the array






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






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






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






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






9. Sort and array alphabetically






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






11. < - > - == - <= - >= - !=






12. _________ in perl - An associative array






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






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






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






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






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






18. In arrays elements need not be __________






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






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






21. Removes the first element of the array shift






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






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






24. 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






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






26. Does the hash key with "keyName" exists






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






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






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






30. Returns the length of the string including escape sequences






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






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






33. Arrays can be assigned or read in _________






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






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






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






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






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






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






40. Removes the last element from the array pop






41. 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






42. Removes trailing newline






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






44. To include modules in perl






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






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






47. 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






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






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






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