I have something like
dsadjakldjska
safdsfdsfsf
fdsfsf**STGN**fdsfsd
fdsfkjldsf
fdsff
fdsfs**IRV**fdsfs
and I want to get
dsadjakldjska
safdsfdsfsf
fdsfkjldsf
fdsff
fdsfsf**STGN**fdsfsd
fdsfs**IRV**fdsfs
but only for an interval of lines (say line 40000 till end of file) (moving the line containing STGN right above the next IRV underneath it)
Any idea how I can do this, or whether there's a better alternative for this than sed?