dumping MySQL usernames

Brief note on sed, its use with variables and also changing variables inside the file which is being run.

Generally to use sed, we would do;

sed -i 's/old-text/new-text/g' file.txt

where file.txt is the file containing old-text and new-text.

If we want to ensure that our search term is at the beginning of the line, we add the ^ as follows;

sed -i 's/^old-text/new-text/g' file.txt

Quadratics

 

Regex examples

REGEX