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A SED program consists of one or more SED commands,
passed in by one or more of the
-e, -f, --expression, and --file
options, or the first non-option argument if zero of these
options are used.
This document will refer to "the" SED script;
this will be understood to mean the in-order catenation
of all of the scripts and script-files passed in.
Each SED command consists of an optional address or address range, followed by a one-character command name and any additional command-specific code.
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