/usr/share/sagemath/bin/sage-grepdoc is in sagemath-common 7.4-9.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/usr/bin/env bash
cd "$SAGE_DOC"
find html -print | GREP_OPTIONS= egrep '.html$' | xargs grep "$@"
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