writing bash script to change text and write to a log

sed -i '0,/dev/ s/dev/stage/' config.inc.php

sed -i  "/<dev>/,/<dev>/ s/dev/stage/" config.inc.php

date >> /path/to/dev/run.log

sed -i -r '0,/<dev>/s/<dev>/stage/' config.inc.php

cat config.inc.php | sed 's:dev::stage' > config.inc.php.new

echo $timestamp >> mylogfile.log

sed -i -e s/dev/stage/ config.inc.php