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Test your basic knowledge |
Perl Programming
Start Test
Study First
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 read an entire file into an array (one line per element)
Expression character classes
@entireFile=<FILEHANDLE>
size string comparison operators
join(':', @array)
2. Returns a copy of the string as all lower case
lc($string)
$hashName{keyName}="Value to Add"
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
uc($string)
3. _________ in perl - An associative array
system() function
Variable context
newline
Hash variables
4. Arrays can be assigned or read in _________
basic binding operators
exists($hashName{keyName})
newline
scalar context (Ex: $myArray[4] = 2)
5. A special system variable used to pass arguments to script
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
hash functions
@ARGV
$#arrayName
6. Removes the last element from the array pop
ucfirst($string)
(@array)
substr($string, $startindex, $numchars)
length($string)
7. Returns a copy of the string with the first letter upper case
ucfirst($string)
newline
chomp($string)
each(%hash)
8. Assignment of a hash variable for a single hash element
$hashName{keyName}="Value to Add"
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
Assignment
array functions
9. The three basic ________ of the open() function: > write - >> append - < read file
$hashName{keyName}="Value to Add"
access modes
reverse(@array)
Expression character classes
10. scalar(@arrayName) returns the ______ of the array names
push(@array, $newValue)
similar data types
@arrayName size
last index
11. Add a new element to the from of the array with the value $newwValue
unshift(@array, $newValue)
(@array)
Variable context
command substitution
12. 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
Assignment
system() function
Scalar variables
@arrayName size
13. Adds a new element to end of the array with value $newValue
FILEHANDLE
$hashName{keyName}="Value to Add"
push(@array, $newValue)
Array variables
14. ________ in perl - can be scalar array or hash context - tells the interpreter what you are looking for (Ex: "$arrayname[$index_number]")
unshift(@array, $newValue)
(@array)
Special array
Variable context
15. Stores information about the current users environment. You can print this from the command line using printenv
%ENV hash array
hash functions
like functions
interpreter
16. To write to a filehandle
delete($hashName{key})
print(FILEHANDLE "Data to outputn");
push(@array, $newValue)
Expression character classes
17. Two ____________ in regular expressions: =~ Contains - !~ Does not contain
Expression Quantifiers
system() function
lcfirst($string)
basic binding operators
18. The four types of loops in perl: while - until - for - ________
command substitution
push(@array, $newValue)
access modes
foreach
19. Returns all of the values of the hash as an array
Assignment
@ARGV
keys(%hash)
values(%hash)
20. _________ of scalar variables in perl - using "=" - Ex: $myVariable = 5;
comments
Assignment
chomp($string)
$hashName{keyName}="Value to Add"
21. In arrays elements need not be __________
(@array)
size string comparison operators
like functions
similar data types
22. Returns the length of the string including escape sequences
command substitution
length($string)
unshift(@array, $newValue)
access modes
23. Returns a two element ray of the next key value pair; resultArray[0] is the key resultArray[1] is the value
chomp($string)
newline
each(%hash)
exists($hashName{keyName})
24. eq - ne - lt - le - gt - ge
size string comparison operators
lcfirst($string)
flow-control
uc($string)
25. _________ @arrayName) returns the size of the array
scalar
interpreter
@ARGV
arithmetic comparison operators
26. 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
command substitution
foreach
Expression Quantifiers
split(/\s/, $string)
27. Swap keys for values and values for keys. Will cause issues if there are multiple hash entries with the same value
Expression Quantifiers
keys(%hash)
hash functions
reverse(%hashName)
28. Regular __________: * - 0 or more characters - + - 1 or more characters - ? - 0 or 1 characters
comments
length($string)
string manipulation functions
Expression Quantifiers
29. Does the hash key with "keyName" exists
$hashName{keyName}="Value to Add"
exists($hashName{keyName})
keys(%hash)
reverse(%hashName)
30. Regular ____________: w - alphanumeric word including underscor - d - digits 0-9 - s any whitespace - . - any character
execution block
arithmetic comparison operators
Hash variables
Expression character classes
31. 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
last index
Variable context
(@array)
interpreter
32. To get rid of the ________ in $line you could now chomp() (Ex: chomp($line);)
newline
arithmetic comparison operators
string manipulation functions
command substitution
33. The use of ______ in perl - Documenting code - Created by placing a "#" on a line. - are not multi-line
comments
@arrayName size
system commands
flow-control
34. Sort and array alphabetically
split(/\s/, $string)
sort(@array)
reverse(%hashName)
Expression Quantifiers
35. Reverses the elements of the array
reverse(@array)
delete($hashName{key})
$line=<FILEHANDLE>
chomp(@string)
36. ________ in perl - A collection of data (static data or scalar variables or arrays or hashes can all be stored in an array element)
Array variables
lc($string)
execution block
join(':', @array)
37. Returns the sub string starting at index $startindex and ending after $numchars chars in the string $string
substr($string, $startindex, $numchars)
newline
$hashName{keyName}="Value to Add"
lc($string)
38. Common ________: pop(@array) - push(@array, $new Value) - shift(@array) - unshift(@array, $newValue) - sort(@array) - reverse(@array)
reverse(%hashName)
each(%hash)
print(FILEHANDLE "Data to outputn");
array functions
39. Explain how to read a line from a file handle
exists($hashName{keyName})
(@array)
(@array)
$line=<FILEHANDLE>
40. The two primary methods of executing _______ in perl: - system("command args") - - `command args`
each(%hash)
system commands
Array variables
join(':', @array)
41. The use of "if" "if-else" and "if-elsif-else"
basic binding operators
substr($string, $startindex, $numchars)
flow-control
hash functions
42. Removes trailing newline
(@array)
chomp($string)
comments
FILEHANDLE
43. The variable that provides the last index of an array
$#arrayName
Editing
lcfirst($string)
Expression Quantifiers
44. Returns a copy of the string as all upper case
uc($string)
basic binding operators
$hashName{keyName}="Value to Add"
system() function
45. The two phases of creating a PERL program _______ - Execution
size string comparison operators
basic binding operators
Editing
lcfirst($string)
46. _________ in perl - Singular variable - starts with "$" - Number or characer or string- Perl does automatic type conversion of these
Scalar variables
interpreter
(@array)
use moduleName; Ex: use Roman;
47. Assignment of hash variables in perl (when oringally defining the hash)
like functions
hash functions
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
flow-control
48. $#arrayName returns the value of the ______ of the array (NOT the data stored in that array element)
split(/\s/, $string)
ucfirst($string)
$#arrayName
last index
49. Modules in perl - Synonymous with header files in C - Collection of ______ and variables that may be used in your program
execution block
like functions
hash functions
chomp(@string)
50. To include modules in perl
use moduleName; Ex: use Roman;
command substitution
sort(@array)
Special array
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