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Go Systems Programming

You're reading from   Go Systems Programming Master Linux and Unix system level programming with Go

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Product type Paperback
Published in Sep 2017
Publisher Packt
ISBN-13 9781787125643
Length 466 pages
Edition 1st Edition
Languages
Tools
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Author (1):
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Mihalis Tsoukalos Mihalis Tsoukalos
Author Profile Icon Mihalis Tsoukalos
Mihalis Tsoukalos
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Table of Contents (13) Chapters Close

Preface 1. Getting Started with Go and Unix Systems Programming FREE CHAPTER 2. Writing Programs in Go 3. Advanced Go Features 4. Go Packages, Algorithms, and Data Structures 5. Files and Directories 6. File Input and Output 7. Working with System Files 8. Processes and Signals 9. Goroutines - Basic Features 10. Goroutines - Advanced Features 11. Writing Web Applications in Go 12. Network Programming

Rotating log files

Log files tend to get bigger and bigger all the time because data is written to them all the time; it would be good to have a technique for rotating them. This section will present such a technique. The name of the Go program will be rotateLog.go, and it will be presented in three parts. Note that for a process to rotate a log file, the process must be the one that opened that log file for writing. Trying to rotate a log that you do not own might create problems on your Unix machine, and should be avoided!

What you will also see here is another technique where you use your own log file for storing your log entries, with the help of log.SetOutput(): after a successful call to log.SetOutput(), each function call to log.Print() will make the output go to the log file used as the parameter of log.SetOutput().

The first part of rotateLog.go is the following:

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