using sed to delete matching line from multiple text files -

all files in directory of project has 1 line:

var $usedbconfig = 'default_dev'; 

how can delete line files , save same file, single line command using sed?

if sed version supports -i option use command interactively delete line files in current directory:

sed -i "/var \$usedbconfig = 'default_dev';/d" ./* 

furthermore: way quote string works in bash. in other shells (like csh) should adjust pattern.