1. | Special Literals | | |
2. | Splitting up $_ | | |
3. | Splitting up $_ and creating an unnamed list | | |
4. | The list separator is a comma | | |
5. | The list separator is the empty string | | |
6. | Passing Arguments at the Command Line | | |
7. | Special Hashes: The %ENV Hash | | |
8. | The %SIG hash sets signal handlers for signals. | | |
9. | A program that changes the value of $/. | | |
10. | A program that uses the $" (dollar and quotation) variable. | | |
11. | A program that uses the $(dollar), variable. | | |
12. | A program that uses the $< variable. | | |
13. | A program that uses the $\(dollar and slash) variable. | | |
14. | A simple program that assigns to $_ using . | | |
15. | A simple version of the cat command using $_. | | |
16. | ARGV and the Null Filehandle | | |
17. | ARGV in Perl represents the command-line arguments. | | |
18. | Aliases and Values | | |
19. | Alternative names for Perl system variables. | | |
20. | Assign elements in @_ to scalar | | |
21. | Assign string array to @ARGV by using qw | | |
22. | Assign value to @_ | | |
23. | Build the ARGV array with qw function | | |
24. | @_ has runtime scope. | | |
25. | A more expanded version for showing how to use the $_ | | |
26. | Built-in variables: $_ | | |
27. | Call-by-Reference and the @_ Array | | |
28. | Capturing fatal errors | | |
29. | Catching the sigINT signal | | |
30. | Code the $_ specifically | | |
31. | Compare value entered with number with underscore | | |
32. | Error message is stored in $! | | |
33. | Extracts information from the $] variable. | | |
34. | $! is the error number | | |
35. | $! stores the error message | | |
36. | $" is the separator | | |
37. | $# is the default format | | |
38. | $(dollar), is the separator | | |
39. | $MATCH = $& | | |
40. | $SIG{__DIE__} | | |
41. | $SIG{__WARN__} = 'IGNORE'; | | |
42. | $SIG{__WARN__} = sub {die "Warning: $_[0]"}; | | |
43. | $\ is 'END_OF_OUTPUT' | | |
44. | $^ is the format header | | |
45. | $^O stores the name of the operating system | | |
46. | $^S: is inside eval | | |
47. | $^W: Check the '-w switch' | | |
48. | $^X: get the Perl execuatable file name | | |
49. | $_ for print function | | |
50. | $_ stores the user input | | |
51. | $~ is the format | | |
52. | %INC values | | |
53. | File-searching program using $ARGV. | | |
54. | Get Computer Name key in the %ENV | | |
55. | Get local time from $^T | | |
56. | If $_contains needle, the string is printed. | | |
57. | Integer signal | | |
58. | Lines Remaining on the Page: $- | | |
59. | List all command line argument | | |
60. | Local builtin var | | |
61. | Locate all numbers less than 6 | | |
62. | Manipuate @_ and return @_ | | |
63. | Mannually change the $1 variable | | |
64. | Match: $& | | |
65. | Perl 5 Built-In Variables | | |
66. | Perl's modules reside in the directories named in the @INC array, or subdirectories | | |
67. | Perl's special arrays | | |
68. | Perl's special variables | | |
69. | Postmatch $' | | |
70. | Prematch: $` | | |
71. | Print all command line argument | | |
72. | Print the default variable's ($_) value | | |
73. | Quick Sum | | |
74. | Read and set environment variables? | | |
75. | Read lines from supplied filenames | | |
76. | Resetting array base | | |
77. | Retrieving the Entire Pattern: $& | | |
78. | Saving in the $& special scalar | | |
79. | Set the $/ and chomp | | |
80. | Special Variables | | |
81. | System variables that control how write sends output to a file | | |
82. | Test of open and die with $!. | | |
83. | The $_ Scalar Variable | | |
84. | The @* field | | |
85. | The @ISA Array and Calling Methods | | |
86. | The Argument Vector @ARGV | | |
87. | The Pattern-Matching Operator and $_ | | |
88. | The Substitution Operator and $_ | | |
89. | The code executes a line of code you type as long as that line doesn't start with a # | | |
90. | The environment associative array: Associative arrays %ENV holds your system's environment variables. | | |
91. | The following functions and operators work with the $_ variable by default: | | |
92. | The shift operator returns an undefined value if the array has no more elements. | | |
93. | To list all .pm files by using the @INC array | | |
94. | Use while loop to display all entries in ENV | | |
95. | Using $, to set the separator for print command | | |
96. | Using $_ (dollar underscore) | | |
97. | Using $_ as the array index | | |
98. | Using $_ variable with while statement | | |
99. | Using %SIG to define our own signal handlers | | |
100. | Using @_ directly | | |
101. | Using __LINE__ to output line number | | |
102. | Using eof and <> together. | | |
103. | Using the $. variable. | | |
104. | Using the $;(dollar and semicolon) variable. | | |
105. | Using the @_ to reference the parameter | | |
106. | Using the Default Variable $_ | | |
107. | Using the diamond operator with @ARGV | | |
108. | Using the if statement to check the command line parameters | | |
109. | Using the special Perl variable $! in the message passed to die. | | |
110. | Using tr to convert all file names passed in to uppercase | | |
111. | Verify the total number of the command line parameter | | |
112. | Working with $_ usually makes programming much easier, but more confusing to the uninitiated | | |
113. | You display the current line of execution in a Perl script by referring to it with the __LINE__ token. | | |
114. | You display the name of the current Perl package with __PACKAGE__. | | |
115. | You display the name of the current file with the __FILE__ token | | |
116. | foreach (@_) | | |
117. | foreach loop and $_ | | |
118. | or die $! | | |
119. | or die $^E; | | |
120. | print "Hello, $ENV{USER}!\n"; | | |
121. | print $INC{'English.pm'}; | | |
122. | print $]; (Perl version number) | | |
123. | print out all pm library location | | |
124. | prints out each element of @ARGV separately | | |
125. | shift: defaults to shifting @ARGV | | |
126. | time - $^T | | |
127. | undef $/; | | |