Addin to each line of a text file

[plzhelp]

hi,i am having some problem,plz try to make itthere is a text file likesubcat11 /////// line 1subcat12 /////// line 2subcat13 /////// line 3subcat21 /////// line 4subcat22 /////// line 5subcat31 /////// line 6subcat32 /////// line 7subcat41 /////// line 8................... ............................. ............................. ..........i want to append ;#; to each linei am doing but iam getting result smthing like this....subcat11;#;subcat12;#;subcat21;#;subcat22;#;...............................................plz do something-ashish