feat: add flush_dns.sh

Author: kral2

CHANGELOG.md

@@ -14,21 +14,27 @@ Given a version number MAJOR.MINOR.PATCH:
 - MINOR version when adding functionality in a backwards compatible manner,
 - PATCH version when making backwards compatible bug fixes.
 
+## [0.6.0] - 2021-10-01
+
+### Added
+
+- flush_dns.sh: a cli tool to flush macOS DNS cache
+
 ## [0.5.1] - 2021-09-08
 
-## Changed
+### Changed
 
 - cpu_info.sh: use bash function for command usage information
 
 ## [0.5.0] - 2021-09-08
 
-## Added
+### Added
 
 - cpu_info.sh: show cpu specific information (brand, model, core count, thread count)  
 
 ## [0.4.0] - 2021-09-03
 
-## Added
+### Added
 
 - show-hidden-files.sh: add command usage information  
 

system-config/flush_dns.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+# Last update : September, 2021
+# Author: kral2
+# Description: flush DNS cache
+
+script_name=$(basename "$0")
+version="0.1.0"
+echo "$script_name - version $version"
+echo "A cli tool to flush macOS DNS cache"
+echo ""
+
+dscacheutil -flushcache
+sudo killall -HUP mDNSResponder
+
+echo "DNS cache entries flushed, Bonjour restarted."