Simple script to return TCP memory settings and actual usage.

gistfile1.sh

#!/bin/bash
# Author: Ryan C Koch - ryanckoch@gmail.com
# Purpose: Returns TCP Memory settings and Usage
# Arguments: low - Return Low Threshold Setting
#            mem - Return Memory Pressure Setting
#            out - Return Out of Socket Setting
#            use - Return Actual Usage
#            use_thresh - Check Usage Against Settings and Return Threshold

SETTINGS=$(cat /proc/sys/net/ipv4/tcp_mem)
USAGE=$(cat /proc/net/sockstat | awk 'NR==2' | sed 's/TCP.*mem\ //')


LOWTHRESHOLD=$(echo $SETTINGS | awk '{print $1}')
MEMORYPRESSURE=$(echo $SETTINGS | awk '{print $2}')
OUTOFSOCKET=$(echo $SETTINGS | awk '{print $3}')

if [ $# -eq 0 ] ; then
        # Return all settings and actual usage if no arguments received 
        echo 'LOW_THRESHOLD_SETTING: '$LOWTHRESHOLD
        echo 'MEMORY_PRESSURE_SETTING: '$MEMORYPRESSURE
        echo 'OUT_OF_SOCKET_SETTING: '$OUTOFSOCKET
        # Check usage against settings
        if (("$USAGE" < "$MEMORYPRESSURE")) ; then
                echo 'USAGE: '$USAGE
                echo 'LOW_THRESHOLD'
        elif (("$USAGE" >= "$MEMORYPRESSURE")) && (("$USAGE" < "$OUTOFSOCKET")) ; then
                echo 'USAGE: '$USAGE
                echo 'MEMORY_PRESSURE'
        elif (("$USAGE" >= "$OUTOFSOCKET")) ; then
                echo 'USAGE: '$USAGE
                echo 'OUT_OF_SOCKET'
        else
                echo 'ERROR'
        fi

elif [ $# -eq 1 ]; then
        # Return specific info based on argument.
        if [ $1 = "low" ] ; then
                echo $LOWTHRESHOLD
        elif [ $1 = "mem" ]; then
                echo $MEMORYPRESSURE
        elif [ $1 = "out" ]; then
                echo $OUTOFSOCKET
        elif [ $1 = "use" ]; then
                echo $USAGE
        elif [ $1 = "use_thresh" ]; then
                if (("$USAGE" < "$MEMORYPRESSURE")) ; then
                        echo 'LOW_THRESHOLD'
                elif (("$USAGE" >= "$MEMORYPRESSURE")) && (("$USAGE" < "$OUTOFSOCKET")) ; then
                        echo 'MEMORY_PRESSURE'
                elif (("$USAGE" >= "$OUTOFSOCKET")) ; then
                        echo 'OUT_OF_SOCKET'
                else
                        echo 'ERROR'
                fi 
        else
                echo 'INVALID ARGUMENT'
        fi

else
        echo 'INCORRECT NUMBER OF ARGUMENTS'
fi