Running sed scripts on multiple files??

Please excuse my lack of knowledge but I am wondering if there is a way to run a sed script on multiple files. My script is basic and I am used to running it on one file at a time but I have hundreds of files.

I normally use the command:

sed -f scriptname.txt filename.sgm > filename.sgm

My files are not text files (sgml files) and my sed script looks like this:

1,$s/rg="A-0000000034"/rg="A-055101010"/g
1,$s/rg="A-0000000035"/rg="A-055104010"/g
1,$s/rg="A-0000000036"/rg="A-055107010"/g
1,$s/rg="A-0000000037"/rg="A-055108010"/g
1,$s/rg="A-0000000038"/rg="A-055114010"/g
1,$s/rg="A-0000000039"/rg="A-055115010"/g


There are a few hundred lines like this. Any suggestions would be appreciated.

try
the shell will glob (expand) the * into full file names for you.

You may have to adjust the '*' part to get the files you want.

NO !
this is wrong:
sed -f scriptname.txt $file > $file
but:
sed -f scriptname.txt $file > tmp.$file
[ -s tmp.$file ] && mv tmp.$file $file

------
in this case:
1,$s/rg="A-0000000039"/rg="A-055115010"/g
and
s/rg="A-0000000039"/rg="A-055115010"/g
are the same, maybe you can reduce thr regexp to
s/0000000039/055115010/g

>>There are a few hundred lines like this.
i remember sed has limit, believe 200 cmds