How to replace two strings in a file in the same time with sed command ?

[Halid Faith]

Ok
But I have another problem,
I couldn't use any command  interior of sed command. That's to say I have a
script;

yy="file5"
 for i in `cat file1`;
 do
 sed -e 's/old1/new1\ \'$i'/g' -e 's/old2/'cut -d, -f 1 ${yy}'/g'   file2 >
file3
 done

When I run the script,  I get an error, due to using cut command



> Do you mean something like:
>
> sed -e 's/string1/replacement1/g' -e 's/string2/replacement2/g'
>
> or
>
> sed -f instructions.sed
>
> instructions.sed:
>
> s/string1/replacement1/g
> s/string2/replacement2/g
>
> --Alex
>
>