Socket monitoring script

socket-monitoring.sh

##!/bin/bash
#Performs socket monitoring for specific port and outputs the result to a file.
#
#Parameters:
#1st: log file (default:socket-monitoring.sh.csv)
#2nd: number of checks per 1 sec (default:2)
#3rd: port (default:61622)
#
#Example:
# socket-monitoring.sh /media/ws/rhel-socket-monitoring.log 2 61622
#-----------------------------------------------------------------------------------------------------------------------
#Processing params
#-----------------------------------------------------------------------------------------------------------------------
if [[ ! -z $1 ]]; then
  CSV_FILE=$1
else
  CSV_FILE=$0.csv
fi
if [[ ! -z $2 ]]; then
  FREQUENCY=$2
else
  FREQUENCY=2
fi
if [[ ! -z $3 ]]; then
  PORT=$3
else
  PORT=61622
fi
#-----------------------------------------------------------------------------------------------------------------------
#Performing monitoring
#-----------------------------------------------------------------------------------------------------------------------
rm -f $CSV_FILE
DATE=$(date +%Y-%m-%d)
while true; do
  TIME="$DATE $(date +%k:%M:%S)"
  SOCKETS=$(ss -nat state time-wait  dst :$PORT | wc -l)
  echo "$TIME,$SOCKETS" >> $CSV_FILE
  sleep $(bc <<< "scale=2; 1/$FREQUENCY")
done