mjhjmtu

The purpose of the command should be replacing any IP in file myfile.txt with the local ip of the server automatically

example:

sed -i -e 's/[0-9]1,3.[0-9]1,3.[0-9]1,3.[0-9]1,3/LOCALIP/g' myfile.txt

i want to know if it possible to use command for getting local ip address inside sed

basically i want to replace LOCALIP in my example with this command

/sbin/ip -o -4 addr list eth0 | awk 'print $4' | cut -d/ -f1 

You can use command substitution in double quotes:

sed -i -e 's/[0-9]1,3.[0-9]1,3.[0-9]1,3.[0-9]1,3/'"$(/sbin/ip -o -4 addr list eth0 | awk 'print $4' | cut -d/ -f1)/g" myfile.txt

In single quotes, this won't work, so end the single quotes before LOCALIP, use double quotes for the command. This way, we don't accidentally do expansions in the search pattern.

Below command worked fine for me

sed "s/[0-9]1,3.[0-9]1,3.[0-9]1,3.[0-9]1,3/$(/sbin/ip -o -4 addr list eth0 | awk 'print $4' | cut -d/ -f1)/"

i solved my issue with this command

sed -i "s/[0-9]1,3.[0-9]1,3.[0-9]1,3.[0-9]1,3/$(ifconfig | grep 'inet ' | grep -v '127.0.0.1' | awk 'print $2')/" myfile.txt