Multiple replacements with one sed command

Question

I'm wondering how I can do a multiple find/replace using a single sed statment in Mac OSX. I'm able to do this in Ubuntu but because of the BSD nature of OSX, the command must be slightly altered.

So, given a file with the string:

"Red Blue Red Blue Black Blue Red Blue Red" 

I want to run a sed statement that results in the output:

"Green Yellow Green Yellow Black Yellow Green Yellow Green" 

My two sed statements with a qualifying find

color1="Green"   color2="Yellow"   find . -type f -exec sed -i '' s/Red/$color1/g {} \;   find . -type f -exec sed -i '' s/Blue/$color2/g {} \;   

I've tried several combinations of semicolons and slashes, and looked at Apple's Dev man page for sed but with a lack of examples, I couldn't piece it together.

Answer 1

Apple's man page says Multiple commands may be specified by using the -e or -f options. So I'd say

find . -type f -exec sed -i '' -e s/Red/$color1/g -e s/Blue/$color2/g {} \; 

This certainly works in Linux and other Unices.

Answer 2

It should be also possible to combine sed commands using semicolon ;:

find . -type f -exec sed -i '' -e "s/Red/$color1/g; s/Blue/$color2/g" {} \; 

I was wondering how portable this is and found through this Stackoverflow answer a link to the POSIX specification of sed. Especially if you have a lot of sed commands to run, this seems less cluttered to me than writing multiple sed expressions.