sed -i

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-i tells sed to modify the file in place.
-i[SUFFIX], --in-place[=SUFFIX] edit files in place (makes backup if SUFFIX supplied)
sudo sed -i '/#net.ipv4.ip_forward=1/s/^#//g' /etc/sysctl.conf

Related[edit]

.BAK
gsed -i
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See also[edit]

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