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+# Introduction
+
+Sometimes an application needs to save internal state or perform some cleanup activity before it exits, or needs to be able to reload a configuration file or write a memory/cpu profile on demand. In UNIX-like operating systems, signals can accomplish these tasks.
+
+# Example
+
+The following code demonstrates a program that waits for an interrupt signal and removes a temporary file when it occurs.
+
+```
+ package main
+
+ import (
+ "io/ioutil"
+ "os"
+ "os/signal"
+ )
+
+ func main() {
+ f, err := ioutil.TempFile("", "test")
+ if err != nil {
+ panic(err)
+ }
+ defer os.Remove(f.Name())
+ sig := make(chan os.Signal, 1)
+ signal.Notify(sig, os.Interrupt)
+ <-sig
+ }
+```
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