Script to monitor internet connection

The internet often drops at work, so to compile a csv report of the outage time and for how long I wrote this script, which maybe of use to someone.

Simply create the script, with execution rights (sudo chmod a+x) and call the script with the first argument as a resource e.g google and the second argument as the output filename e.g ./monitor.sh google.co.uk myFile

Code below:

#!/bin/bash

resource=$1
outfile=$2
dwnTmp=".dwnLock";
upTmp=".upLock";

# NEED A RESOURCE
if [[ -z "$resource" ]]; then
      	echo "You must define a resource as the first parameter e.g google.co.uk";
	exit; 
fi
####

# NEED A FILENAME
if [[ -z "$outfile" ]]; then
      	echo "You must define an output file as the second parameter";
	exit; 
fi
####

### REMOVE LOCKS
if [ -f "$dwnTmp" ]; then
        rm $dwnTmp;
fi
if [ -f "$upTmp" ]; then
        rm $upTmp;
fi
#################

echo "Logging connectivity of http://$resource/ to $outfile.csv CTRL+C to exit"

# LOOP
count=0
while [ 1=1 ]; do

        let count+=1
        
        time=$(date +"%T")
        timeSec=$(date +%s)
        duration=0
        
        # log
        wget -q --tries=1 --timeout=10 --spider "http://$resource/"
        if [[ $? -eq 0 ]]; then
                if [ ! -f "$upTmp" ]; then
                
                        echo $timeSec > $upTmp;
                        
                        if [ -f "$dwnTmp" ]; then
                                duration=$(($timeSec-`cat $dwnTmp`))
                                rm $dwnTmp;
                                
                        fi
                        
                        echo -ne CHECK $count: AVAIL     '\r'
                        echo "$count,$time,Up after being down for $(($duration / 60)) minutes and $(($duration % 60)) seconds" >> "$outfile.csv"

                fi
        else
                if [ ! -f "$dwnTmp" ]; then
                
                        echo $timeSec > $dwnTmp;
                        
                        if [ -f "$upTmp" ]; then
                                duration=$(($timeSec-`cat $upTmp`))
                                rm $upTmp;
                        fi
                        echo -ne CHECK $count: ERROR   '\r'
                        echo "$count,$time,Down after being up for $(($duration / 60)) minutes and $(($duration % 60)) seconds" >> "$outfile.csv"
                fi
        fi
done
#####

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This entry was posted on Tuesday, April 21st, 2015 at 11:40 am and is filed under Bash. You can follow any responses to this entry through the RSS 2.0 feed.