https://toggen.com.au/it-tips/find-and-replace-a-value-in-multiple-files-in-a-directory-tree

cd /top/of/tree/to/change

fgrep -IlR server_name_here \| 
grep -v "log" \|
xargs sed -i.bak -e 's/server_name_here/new_server_name_here/g'

Find all non binary files (-I) and list them (-l) in the current and sub-directories

Skip any file that has “log” in the name or in the path

Then using sed make a backup copy with a .bak extension and globally find “server_name_here” and replace with “new_server_name_here”