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June 27, 2024 00:15
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macOS script to toggle between static ip and dhcp using different routers
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#!/usr/bin/env bash | |
set -euo pipefail | |
inetInterfaceIp=$( \ | |
ifconfig \ | |
| perl -0777 -pe 's/\n+^[ \t]/ /gm' \ | |
| grep 'inet ' \ | |
| grep RUNNING \ | |
| grep -v LOOPBACK \ | |
| sed -nE 's/([a-z0-9]+).* inet ([^ ]+).*/\1 \2/p' \ | |
| grep -vE '\.1$' \ | |
| head -n1 | |
) | |
inetInterface=$(echo "$inetInterfaceIp" | awk '{ print $1 }') | |
inetIp=$(echo "$inetInterfaceIp" | awk '{ print $2 }') | |
networkSetupInterface=$( \ | |
networksetup -listallhardwareports \ | |
| grep -E 'Port:|Device:' \ | |
| sed 's/Hardware /\n/' \ | |
| sed -E 's/[A-Za-z]+: //g' \ | |
| grep . \ | |
| perl -0777 -pe 's/^(.+)\n(.+)/\2 \1/gm' \ | |
| awk '$1 == "'"$inetInterface"'" { print $0 }' \ | |
| sed -E 's/[^ ]+ //' | |
) | |
router=${1:-} | |
if [[ "$router" == "0" ]] || [[ "$router" == "" ]] && [[ "$inetIp" != 192.168.100.* ]]; then | |
echo "Setting $networkSetupInterface ($inetInterface) DHCP" | |
networksetup -setdhcp "$networkSetupInterface" | |
networksetup -setdnsservers "$networkSetupInterface" Empty | |
else | |
lastOctet=$(echo "$inetIp" | cut -d. -f4) | |
if [[ "$router" == "" ]]; then | |
router="2" | |
fi | |
newIp="192.168.$router.$lastOctet" | |
echo "Setting $networkSetupInterface ($inetInterface) Static IP $newIp" | |
networksetup -setmanual "$networkSetupInterface" "$newIp" 255.255.255.0 "192.168.$router.1" | |
networksetup -setdnsservers "$networkSetupInterface" 1.1.1.1 9.9.9.9 | |
fi |
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