I show you in this little example how to replace quickly text using sed:
1 2 | cat examples.conf foo+bar=foo |
1 | sed -i 's/foo/foo_bar/g' examples.conf |
foo in file examples.conf will be replaced with foo_bar
After replacement:
1 | foo_bar+bar=foo_bar |
Dry run without changes:
1 | sed 's/192.168.0.1/nameserver.local/g' $domain |