5

Append text to a file

 3 years ago
source link: https://yourbasic.org/golang/append-to-file/
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Append text to a file · YourBasic Go

Append text to a file

yourbasic.org/golang

This code appends a line of text to the file text.log. It creates the file if it doesn’t already exist.

f, err := os.OpenFile("text.log",
	os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
	log.Println(err)
}
defer f.Close()
if _, err := f.WriteString("text to append\n"); err != nil {
	log.Println(err)
}

If you’re appending text to a file for logging purposes, see Write log to file.

Related

Write log to file (or /dev/null)
Use os.OpenFile with arguments os.O_APPEND | os.O_CREATE | os.O_WRONLY and 0644 to create and open a log file. To disable all output from a logger set the output destination to ioutil.Discard.
yourbasic.org
Defer a function call (with return value)
A deferred function is executed when the surrounding function returns, either on exit or on panic. Deferred functions are commonly used for clean-up actions, such as closing a file or unlocking a mutex.
yourbasic.org

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This work is licensed under a CC BY 3.0 license.


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