please answer in linux form

tach line below shows a iegal definition that should be output by your egrep command: int vamame Heamment ursigned hit hello_woeld intest 3.8 int bla int _tys: Fad line below show ecamples that should not be outnut by your tgepec cormand unsighed varnares: in H comment mt my_vat invari, uarz: int 123var: ins var = regolar expression. You are tree to lockup a format definition of what variable rames are legai inc