Sed

Search and replace string in single file

$ sudo sed -i -e "s/upload_max_filesize = \"500M\"/upload_max_filesize = \"1200M\"/g" /etc/php7.4/cli/php.ini

Search and replace string in multiple files recursively

$ find /etc/httpd -type f -name '*.conf' -print0 |xargs -0 sed -i -e 's/192.168.1.2/192.168.1.5/g'