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how to edit files Linux (Ubuntu Distr.)

Last Modified: 2012-05-12
In my Linux Server some file not editable or when i edit them after reboot it's back to it previous version.

for example for /etc/ufw/ufw.conf I edit "enable=no" to "enable=yes" and saved it, but after reboot when I print ufw.conf's contents it's back to previous version.
I found a way for this, i change file permission to 755 and edit with root permission and it's not back to previous version.

after it new problem occur for me. I want to edit "/proc/sys/net/ipv4/ip_forward" but it's back to previous version after each reboot. i trying to set permission and receive following error:
root@testserver:/proc/sys/net/ipv4# chmod 755 ip_forward
chmod: changing permissions of `ip_forward': Operation not permitted

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using chattr but it's not work and i received following error:
root@testserver:/proc/sys/net/ipv4# chattr +a ip_forward
chattr: Inappropriate ioctl for device while reading flags on ip_forward

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Whould you mind help me?!
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