TCP-Tweaker

#!/bin/bash
tput setaf 7 ; tput setab 4 ; tput bold ; printf '%35s%s%-20s\n' "TCP Tweaker 1.0" ; tput sgr0
if [[ `grep -c "^#PH56" /etc/sysctl.conf` -eq 1 ]]
then
    echo ""
    echo "TCP Tweaker network settings have already been added to the system!"
    echo ""
    read -p "Do you want to remove TCP Tweaker settings? [y/n]: " -e -i n resposta0
    if [[ "$resposta0" = 'y' ]]; then
        grep -v "^#PH56
net.ipv4.tcp_window_scaling = 1
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 16384 16777216
net.ipv4.tcp_low_latency = 1
net.ipv4.tcp_slow_start_after_idle = 0
net.core.default_qdisc = fq
net.ipv4.tcp_congestion_control = bbr" /etc/sysctl.conf > /tmp/syscl && mv /tmp/syscl /etc/sysctl.conf
sysctl -p /etc/sysctl.conf > /dev/null
        echo ""
        echo "TCP Tweaker network settings were successfully removed."
        echo ""
    exit
    else 
        echo ""
        exit
    fi
else
    echo ""
    echo "This is an experimental script. Use at your own risk!"
    echo "This script will change some network settings"
    echo "to reduce latency and improve speed."
    echo ""
    read -p "Proceed with installation? [y/n]: " -e -i n resposta
    if [[ "$resposta" = 'y' ]]; then
    echo ""
    echo "Modifying the following settings:"
    echo " " >> /etc/sysctl.conf
    echo "#PH56" >> /etc/sysctl.conf
    echo "net.ipv4.tcp_window_scaling = 1
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 16384 16777216
net.ipv4.tcp_low_latency = 1
net.ipv4.tcp_slow_start_after_idle = 0
net.core.default_qdisc = fq
net.ipv4.tcp_congestion_control = bbr" >> /etc/sysctl.conf
    echo ""
    sysctl -p /etc/sysctl.conf
        echo ""
        echo "TCP Tweaker network settings have been added successfully."
        echo ""
    else
        echo ""
        echo "Installation was canceled by the user!"
        echo ""
    fi
fi
exit