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| #!/bin/bash | |
| # Default Configurations | |
| DEFAULT_PING_HOSTS=("8.8.8.8" "1.1.1.1") | |
| DEFAULT_CHECK_INTERVAL=10 | |
| DEFAULT_LOG_FILE="$(dirname "$0")/internet_downtime.log" | |
| # Initialize Configurations | |
| PING_HOSTS=("${DEFAULT_PING_HOSTS[@]}") | |
| CHECK_INTERVAL=$DEFAULT_CHECK_INTERVAL | |
| LOG_FILE=$DEFAULT_LOG_FILE | |
| # Parse Command Line Arguments | |
| while getopts "h:i:l:" opt; do | |
| case $opt in | |
| h) IFS=',' read -r -a PING_HOSTS <<< "$OPTARG";; | |
| i) CHECK_INTERVAL="$OPTARG";; | |
| l) LOG_FILE="$OPTARG";; | |
| *) echo "Usage: $0 [-h hosts] [-i interval] [-l logfile]"; exit 1;; | |
| esac | |
| done | |
| # Function Definitions | |
| check_internet() { | |
| for host in "${PING_HOSTS[@]}"; do | |
| if /sbin/ping -c 1 "$host" &>/dev/null; then | |
| return 0 | |
| fi | |
| done | |
| return 1 | |
| } | |
| log_message() { | |
| echo "$(date) - $1" | tee -a "$LOG_FILE" | |
| } | |
| send_notification() { | |
| local message=$1 | |
| if [ "$(uname)" == "Darwin" ]; then | |
| /usr/bin/osascript -e "Display notification \"$message\" with title \"Connectivity Alert\"" | |
| elif [ "$(expr substr $(uname -s) 1 5)" == "Linux" ]; then | |
| notify-send "Connectivity Alert" "$message" | |
| fi | |
| } | |
| handle_exit() { | |
| log_message "Internet connectivity checker stopped." | |
| exit 0 | |
| } | |
| # Trap SIGINT for graceful termination | |
| trap handle_exit SIGINT | |
| # Main Loop | |
| log_message "Internet connectivity checker started." | |
| notification_sent=0 | |
| down_times=0 | |
| longest_duration=0 | |
| downtime_start=0 | |
| while true; do | |
| if check_internet; then | |
| if [ "$notification_sent" -eq 1 ]; then | |
| send_notification "Internet is reconnected" | |
| notification_sent=0 | |
| downtime_end=$(date +%s) | |
| duration=$((downtime_end - downtime_start)) | |
| down_times=$((down_times + 1)) | |
| longest_duration=$(($duration > $longest_duration ? $duration : $longest_duration)) | |
| fi | |
| echo -ne "\rDowntimes: $down_times | Longest Duration: ${longest_duration}s | Status: \033[32mONLINE\033[0m" | |
| else | |
| if [ "$notification_sent" -eq 0 ]; then | |
| send_notification "Internet is disconnected" | |
| notification_sent=1 | |
| downtime_start=$(date +%s) | |
| log_message "Internet down" | |
| fi | |
| echo -ne "\rDowntimes: $down_times | Longest Duration: ${longest_duration}s | Status: \033[31mOFFLINE\033[0m" | |
| fi | |
| sleep "$CHECK_INTERVAL" | |
| done |
Hello Ibrahim,
I have integrated your Internet Connectivity Checker script on my machine.
I first tested it on Linux-Mint, then I use it now on a CentOS machine.
I found just a very small problem on these two OS.
On check_internet() you use /sbin/ping.
But the default right path for theses two OS is /usr/bin/ping
Thank you very much for this very good and well-built tool.
--
Chris
Chat GPT5 sent me here when I asked for "best Linux script for monitoring internet connection". You might imagine my surprise when I ran it on Ubuntu 20.04 and it reported the connection was down and never changed its opinion. I'm in the "extremely skeptical " camp in regards to LLMs, so this was another juicy data point.
Then I scrolled down and read the note from Chris above. As you haven't acted on this in the three weeks since Chris posted, I guess your attention is elsewhere. But IMO you are famous.
As Chris implied, the wrong path is a trivial problem to correct and I'm proceeding to add uplink and downlink quality judgments and appreciate the help your code has provided.
Best Regards,
Pete
Unfortunately the for loop doing pings only ever uses the first host.
This will be the last note. This script gives the appearance of working by happy accident. Function return values are not evaluated properly. You don't test the function by name after a call, you test $?. The value of the function name as a right hand side is itself (the spelling of the function).
Internet Connectivity Checker
Overview
The Internet Connectivity Checker is a Bash script designed to monitor internet connectivity. It logs downtimes, notifies the user when the internet status changes, and is equipped with customization options for different use cases. This tool is ideal for network troubleshooting and continuous monitoring of your internet connection.
Features
Usage
To use the script, you can either run it with its default settings or provide optional command-line arguments for customization.
Running with Default Settings
Simply execute the script:
Custom Usage
To run the script with custom settings:
./internet_connectivity_checker.sh -h "8.8.8.8,1.1.1.1" -i 5 -l /path/to/your/logfile.log-h: Comma-separated list of hosts to ping (default: "8.8.8.8,1.1.1.1").-i: Interval in seconds between checks (default: 10).-l: Path to the log file (default: same directory as the script).Requirements
This script requires Bash and utilizes common utilities (
ping,date, etc.) available in most Unix-like environments. For notifications:osascript.notify-send.License
This project is open source and available under the MIT License.
Contributions
Contributions, issues, and feature requests are welcome!.
Happy monitoring! Stay connected. 🌐