1. 数字
   1. Checking Whether a String Is a Valid Number
   2. Comparing Floating-Point Numbers
   3. Rounding Floating-Point Numbers
   4. Converting Between Binary and Decimal
   5. Operating on a Series of Integers
   6. Generating Random Numbers
   7. Generating Different Random Numbers
   8. Taking Logarithms
   9. Multiplying Matrices
   10. Using Complex Numbers
   11. Converting Between Octal and Hexadecimal
   12. Putting Commas in Numbers
   13. Printing Correct Plurals
   14. Calculating Prime Factors
2. 字符串
   1. Accessing Substrings
   2. Establishing a Default Value
   3. Exchanging Values Without Using Temporary Variables
   4. Converting Between ASCII Characters and Values
   5. Processing a String One Character at a Time
   6. Reversing a String by Word or Character
   7. Expanding and Compressing Tabs
   8. Expanding Variables in User Input
   9. Controlling Case
   10. Interpolating Functions and Expressions Within Strings
   11. ndenting Here Documents
   12. Reformatting Paragraphs
   13. Escaping Characters
   14. Trimming Blanks from the Ends of a String
   15. Parsing Comma-Separated Data
   16. Soundex Matching
   17. fixstyle
   18. psgrep
3. 日期和时间
   1. Finding Today's Date
   2. Converting DMYHMS to Epoch Seconds
   3. Converting Epoch Seconds to DMYHMS
   4. Adding to or Subtracting from a Date
   5. Difference of Two Dates
   6. Day in a Week/Month/Year or Week Number
   7. Parsing Dates and Times from Strings
   8. Printing a Date
   9. High-Resolution Timers
   10. Short Sleeps
   11. hopdelta
4. 数组
   1. Specifying a List In Your Program
   2. Printing a List with Commas
   3. Changing Array Size
   4. Doing Something with Every Element in a List
   5. Iterating Over an Array by Reference
   6. Extracting Unique Elements from a List
   7. Finding Elements in One Array but Not Another
   8. Computing Union, Intersection, or Difference of Unique Lists
   9. Appending One Array to Another
   10. Reversing an Array
   11. Processing Multiple Elements of an Array
   12. Finding the First List Element That Passes a Test
   13. Finding All Elements in an Array Matching Certain Criteria
   14. Sorting an Array Numerically
   15. Sorting a List by Computable Field
   16. Implementing a Circular List
   17. Randomizing an Array
   18. words
   19. permute
5. 散列
   1. Adding an Element to a Hash
   2. Testing for the Presence of a Key in a Hash
   3. Deleting from a Hash
   4. Traversing a Hash
   5. Printing a Hash
   6. Retrieving from a Hash in Insertion Order
   7. Hashes with Multiple Values Per Key
   8. Inverting a Hash
   9. Sorting a Hash
   10. Merging Hashes
   11. Finding Common or Different Keys in Two Hashes
   12. Hashing References
   13. Presizing a Hash
   14. Finding the Most Common Anything
   15. Representing Relationships Between Data
   16. dutree
6. 模式匹配
   1. Copying and Substituting Simultaneously
   2. Matching Letters
   3. Matching Words
   4. Commenting Regular Expressions
   5. Finding the Nth Occurrence of a Match
   6. Matching Multiple Lines
   7. Reading Records with a Pattern Separator
   8. Extracting a Range of Lines
   9. Matching Shell Globs as Regular Expressions
   10. Speeding Up Interpolated Matches
   11. Testing for a Valid Pattern
   12. Honoring Locale Settings in Regular Expressions
   13. Approximate Matching
   14. Matching from Where the Last Pattern Left Off
   15. Greedy and Non-Greedy Matches
   16. Detecting Duplicate Words
   17. Expressing AND, OR, and NOT in a Single Pattern
   18. Matching Multiple-Byte Characters
   19. Matching a Valid Mail Address
   20. Matching Abbreviations
   21. urlify
   22. tcgrep
   23. Regular Expression Grabbag
7. 文件访问
   1. Opening a File
   2. Expanding Tildes in Filenames
   3. Making Perl Report Filenames in Errors
   4. Creating Temporary Files
   5. Storing Files Inside Your Program Text
   6. Writing a Filter
   7. Ｍodifying a File in Place with Temporary File
   8. Modifying a File in Place with -i Switch
   9. Modifying a File in Place Without a Temporary File
   10. Locking a File
   11. Flushing Output
   12. Reading from Many Filehandles Without Blocking
   13. Storing Filehandles in Variables
   14. Printing to Many Filehandles Simultaneously
   15. Opening and Closing File Descriptors by Number
   16. Copying Filehandles
   17. lockarea
8. 文件内容
   1. Reading Lines with Continuation Characters
   2. Counting Lines (or Paragraphs or Records) in a File
   3. Processing Every Word in a File
   4. Reading a File Backwards by Line or Paragraph
   5. Trailing a Growing File
   6. Picking a Random Line from a File
   7. Randomizing All Lines
   8. Reading a Particular Line in a File
   9. Processing Variable-Length Text Fields
   10. Removing the Last Line of a File
   11. Processing Binary Files
   12. Using Random-Access I/O
   13. Updating a Random-Access File
   14. Reading a String from a Binary File
   15. Reading Fixed-Length Records
   16. Reading Configuration Files
   17. Testing a File for Trustworthiness
   18. tailwtmp
   19. laston
9. 目录
   1. Getting and Setting Timestamps
   2. Deleting a File
   3. Copying or Moving a File
   4. Recognizing Two Names for the Same File
   5. Processing All Files in a Directory
   6. Globbing, or Getting a List of Filenames Matching a Pattern
   7. Processing All Files in a Directory Recursively
   8. Removing a Directory and Its Contents
   9. Renaming Files
   10. Splitting a Filename into Its Component Parts
   11. symirror