[Need help on shell script] - Galaxy Ace S5830 General

Can anyone tell me how to add lines in one file by another bash file?
I make a script to change governors and frequency but I need to make the setting set on boot (But I dun want use 3rd party app like SetCPU).
So I need to add these lines to init.d folder's file :
Code:
#!/system/bin/bash (and i add line but this is by default?)
echo "interactiveX" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor (if the next time i chg setting , will this line be deleted or there will be another line with new setting?)
echo "800000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
echo "245670" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
so what command should i use to add these line ?

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Code:
#!/system/bin/sh

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an0nym0us_ said:
Code:
#!/system/bin/sh
Click to expand...
Click to collapse
thanks for your reply but i dont really understand...
those '800000' , '245670' and 'interactiveX' are just some example
i mean i want to write this:
echo "800000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
in init.d folder's file by other file

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this file is in /system/bin
so i can access and chg my cpu setting by typing 'cpuclock'
there for i need a command to add line to init.d in order to set on boot
Code:
echo " Change CPU Governor Profile "
echo ""
echo ""
echo " Current Governor: "
echo "$CUR_GOV"
echo ""
$sleep
echo " Available Governors: "
echo "$AVAIL_GOV"
echo ""
$sleep
echo " Insert your desired governor: "
echo -n " Your Governor: ";read GOV
echo $GOV > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
[COLOR="Red"][so now i change my current governor,but the governor will be reset to default(ondemand) after next reboot]
[all i want is , while echoing current governor , i need to add one line to init.d there too , but i don know how :(][/COLOR]
echo " Complete "
echo ""
$sleep
echo -e " Current Governor: "
echo ""
echo ""
$sleep
echo -n " Press Enter Key To Continue... ";
read enterKey
opt=0;;

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asd