conditional replacement

hi,

i would like replace line 2 if in line 4 for thousand of files?
Unlucky my below attempt works not until now, because i find no example in t
he web
how i refer to line 2 and 4 optimal and i'm not sure whta's the perfect tool
 -
bash only, sed or awk?

for i in * do ; awk `/type,1/ {sub(/lfdn,/,"lfdn,100")}` $i ; done

many
thanks
Christian

w_a_x_man@yahoo.com (William James) wrote in message news:<f8860640.0411212323.15e4edbe@pos
ting.google.com>...
> ozric@web.de (christian) wrote 
>
>
> -----
>
> # If "type,1" is found in line 4, then in line 2 "lfdn," needs to be
> # changed to "lfdn,100".
> NR > 1 && NR<5 {
>   if ( 4==NR )
>   { if ( $0 ~ /type,1/ )
>       sub( /lfdn,/, "lfdn,100", a[2] )
>     print a[2] "\n" a[3]
>     print
>   }
>   else
>     a[NR] = $0
>   next
> }
>
> { print }
>
> -----
>
> Is this what you want?

Yes that's a perfect starting point - many thanks!