Your current script is functional, but there are several ways to make it more efficient and robust. Below is an optimized version of your script:
Bash:
#!/bin/bash
# Exit if no arguments were provided
if [ -z "$1" ]; then
echo "Error: No target specified for ping."
exit 1
fi
# Perform the ping and extract the packet loss percentage directly
loss=$(ping -c 20 "$1" | awk -F '[ %]+' '/packet loss/ {print $6}')
# Check if the 'loss' variable is a number, indicating we successfully got the packet loss
if ! [[ $loss =~ ^[0-9]+$ ]]; then
echo "Error: Could not determine packet loss."
exit 1
fi
# Compare loss as an integer, and send a notification if it's less than 3%
if (( loss < 3 )); then
# Call the API. Be careful with sensitive information in URLs.
curl -k -s "https://uptime.example.com/api/push/key?status=up&msg=OK&ping=$loss"
fi
Optimizations and improvements:
1.
Argument Checking: The script now checks whether an argument was passed, improving its robustness by handling cases where it's called without arguments.
2.
Direct Extraction: Instead of multiple commands (`grep`, multiple `awk`, `echo`, `rev`, `cut`), we use a single `awk` command. This method is more efficient because it spawns fewer subprocesses and avoids the overhead of passing data from one process to another.
3.
Error Checking: The script checks if the `loss` variable holds a valid number (the percentage of packet loss). If `ping` fails or produces unexpected output (like in case of a network error), the script doesn't falsely report a 0% loss.
4.
Integer Comparison: Instead of comparing strings, we compare the loss as an integer. Bash can perform arithmetic comparisons, which are more appropriate here than string comparisons.
5.
Security Note: The `curl` command includes a URL that might be used with sensitive data. Ensure that this practice complies with your security protocols. Using HTTPS and potentially adding authentication headers is advisable for production environments.
This version of the script is more reliable and should provide more accurate results, as well as better handling of edge cases.
GPT4 says this.
