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






2. < - > - == - <= - >= - !=






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






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






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






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






7. Sort and array alphabetically






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






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






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






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






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






13. Delete the hash entry with the key given






14. 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






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






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






17. Reverses the elements of the array






18. Remove trailing newline from each element in the array






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






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






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






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






23. Split string into an array using spaces as delimeter






24. Removes the first element of the array shift






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






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






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






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






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






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






31. Arrays can be assigned or read in _________






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






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. 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






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






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






37. _________ in perl - An associative array






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






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






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






41. To write to a filehandle






42. In arrays elements need not be __________






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






44. Does the hash key with "keyName" exists






45. Removes trailing newline






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






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






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






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






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


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