Sed example - removing lines

for file in `grep -r mysqld t|cut -d: -f1|uniq`; do sed -i -e '/use Test::mysqld/d; /Test::mysqld->new/N; /Test::mysqld->new/N; /Test::mysqld->new/N; /Test::mysqld->new/N; /Test::mysqld->new/N; /Test::mysqld->new/d; /traits/d' $file; done; find t -name '*-e' -delete

Result: