update_modprobe_conf.sh

#!/bin/bash

FILE="/etc/modprobe.d/modprobe.conf"
COMMENT="# disable power save and enable sw encryption (added by FreedomBen's driver)"
OPTION1="options rtl8192ce ips="
OPTION1_VAL="1"
OPTION2="options rtl8192ce fwlps="
OPTION2_VAL="0"
OPTION3="options rtl8192ce swenc="
OPTION3_VAL="1"

opt1 () {
    echo "${OPTION1}${OPTION1_VAL}"
}

opt2 () {
    echo "${OPTION2}${OPTION2_VAL}"
}

opt3 () {
    echo "${OPTION3}${OPTION3_VAL}"
}

if [ "$(id -u)" = "0" ]; then
    CONTAINS_O1=0
    CONTAINS_O2=0
    CONTAINS_O3=0
    WRITE=0

    if [ -f "$FILE" ]; then
        while read line; do
            if [ "$line" = "$(opt1)" ]; then
                CONTAINS_01=1
            elif [ "$line" = "$(opt2)" ]; then
                CONTAINS_O2=1
            elif [ "$line" = "$(opt3)" ]; then
                CONTAINS_O3=1
            fi
        done < $FILE
    fi

    if [ "$CONTAINS_01" = "1" ] && [ "$CONTAINS_O2" = "1" ] && [ "$CONTAINS_O3" = "1" ]; then
        echo "Power save already disabled in ${FILE}. Doing nothing"
    else
        echo -e "\n\nIt is recommended to disable power save features for improved performance.\nThis is done by writing some options to ${FILE}."  
        read -p "Do this now? (y/n): " PROCEED

        if [ "$PROCEED" = "y" -o "$PROCEED" = "Y" ]; then
            if [ -f $FILE ]; then
                # Remove all lines matching our options
                TFILE=".mp.tmp"
                touch $TFILE
                while read line; do
                    if [[ ! $line =~ $OPTION1 ]] && [[ ! $line =~ $OPTION2 ]] && [[ ! $line =~ $OPTION3 ]] && [[ ! $line =~ FreedomBen ]]; then
                        echo $line >> $TFILE
                    fi
                done < $FILE
                mv $TFILE $FILE
            else
                touch $FILE
            fi

            if (( $(cat $FILE | wc -l) )); then
                echo -e "\n\n" >> $FILE
            fi

            echo "$COMMENT" >> $FILE
            echo "$(opt1)" >> $FILE
            echo "$(opt2)" >> $FILE
            echo "$(opt3)" >> $FILE
            echo "Done.  Power save disabled in ${FILE}"
        else
            echo "Did not disable power save options"
        fi
    fi
else
    echo "Must be root to disable power save options. Re-run with sudo"
fi