Apply Multiple Substitutions To The Input

You can apply multiple substitutions to the input of a sed command a couple ways.

One of those ways is to use the -e flag multiple times to define substitutions that should be appended to the sed script.

$ echo 123 | sed -e 's/3/three/' -e 's/1/one/'
one2three

Another way is to define a single string as the sed script and separate each substitution with a ; (semicolon).

$ echo 123 | sed 's/3/three/; s/1/one/'
one2three

Each of these will run each substitution in the sed script sequentially for each line in the input.