(シェルスクリプト) - ユーザー入力を使用したファイルの変更

このスクリプトは問題を解決します。そして次回ソリューション全体を尋ねるのではなく、質問があるかどうかを尋ねるスクリプトを書いてください。

#! /bin/bash
function menu {
    echo ""
    echo "++++++++++++++++++++++++++++++++++++++++++++"
    echo "+++++proxychain applications version1.0+++++"
    echo "++++++++++++++++++++++++++++++++++++++++++++"
    echo "[1] Add Proxychain"
    echo "[2] Start Proxychains" 
    echo "[3] Exit"
    echo "[4] Cat specified file"
    read -p "Please select an option : " option
}

function input {
    read -p "Input Type of Proxy : " type
        read -p "Input Proxy IP Address : " ip_addr
        read -p "Inport Proxy Port : " port
        if [ ! -z "${type}" ]&&[ ! -z "${ip_addr}" ]&&[ ! -z "${port}" ]
    then
        echo -e "${type}\t${ip_addr}\t${port}" >>proxychains.conf
    else
        input   
    fi
}

function start {
    echo "proxychains firefox"
}

function terminate {
    if [ -z "$(pgrep firefox)" ]
    then
        echo -e "Goodbye\n"
        sleep 1
        end_script=1
        exit 0
    else
        echo -e "Terminating firefox!\n"
        pkill firefox
        echo "Goodbye"
        end_script=1
        exit 0
    fi
}

function catme {
    read -p "Input the file path : " file_path
    cat "${file_path}"
    exit 0
}

end_script=0
while [ "${end_script}" != 1 ];do
    menu
    current_stage=${option}
    case ${option} in
        1)
            input
        ;;

        2) 
            start
        ;;

        3) 
            terminate
            exit 0
        ;;

        4)  
            catme
        ;;

        *)
            echo "unknown usage!"
        ;;
    esac