Note: if you need a simple connection icon, check out BitBar and its internet checker plugin.
This program notifies you when Internet goes down and when it comes back up.
It pings Google's DNS every 4 seconds; when a ping fails it quickly tries a few more times and switches to downtime mode. When Internet is available again, the cycle restarts.
bashpingosascript (AppleScript, for the OSX notifications)Remove lines with osascript to make it compatible outside OS X
| #!/bin/bash | |
| # Details: https://gist.github.com/bfred-it/7a269ca212faced83e60 | |
| # License: WTFPL | |
| # By: Federico Brigante | |
| #config | |
| retries=6 | |
| check_interval=4 #seconds | |
| check_interval_hyper=0.2 | |
| check_interval_down=0.5 | |
| ping_timeout=1 #integers only, ping's fault | |
| offline_message="❌ You are offline" | |
| online_message="✅ You are back online!" | |
| #program | |
| echo $(date +"%T") "Hi. I will notify you when the internet goes down" | |
| while true; do | |
| status=$retries | |
| # check connectivity every 4 seconds | |
| while ! [ "$status" -eq 0 ]; do | |
| if ! ping -c 1 -t $ping_timeout -q 8.8.8.8 > /dev/null 2>&1; then | |
| echo $(date +"%T") "Ping timed out" | |
| # echo $(date +"%T") "You may be offline. Tries left:" $status | |
| let "status -= 1" | |
| sleep $check_interval_hyper | |
| else | |
| # if ! [[ "$status" -eq $retries ]]; then | |
| # echo 'It was only temporary. You are online' | |
| # fi | |
| status=$retries # restore counter | |
| sleep $check_interval | |
| fi | |
| done | |
| # if it reaches this point, you are offline | |
| echo $(date +"%T") $offline_message | |
| offline_since=$(date +"%s") | |
| osascript -e "display notification \"\" with title \"$offline_message\"" | |
| while ! ping -c 1 -t $ping_timeout -q 8.8.8.8 > /dev/null 2>&1; do | |
| sleep $check_interval_down | |
| done | |
| # if it reaches this point, you are back online | |
| online_since=$(date +"%s") | |
| downtime_duration=$(($online_since-$offline_since)) | |
| echo $(date +"%T") $online_message 'It lasted' $downtime_duration 'seconds' | |
| osascript -e "display notification \"You were offline for $downtime_duration seconds\" with title \"$online_message\"" | |
| done |