sed-char-to-html-entity-decimal

#!/bin/sh
#
# sed script to convert characters to HTML entities using decimal format.
#
# Example:
#
#     $ echo "αβγ" | sed-char-to-html-entity-decimal
#     &#945;&#946;&#947;
#
# Version: 1.1.0
# Created: 2012-04-01
# Updated: 2015-01-25
# Contact: Joel Parker Henderson (joel@joelparkerhenderson.com)
# License: GPL
##
set -euf

sed 's/ƒ/&#402;/g;s/Α/&#913;/g;s/Β/&#914;/g;s/Γ/&#915;/g;s/Δ/&#916;/g;s/Ε/&#917;/g;s/Ζ/&#918;/g;s/Η/&#919;/g;s/Θ/&#920;/g;s/Ι/&#921;/g;s/Κ/&#922;/g;s/Λ/&#923;/g;s/Μ/&#924;/g;s/Ν/&#925;/g;s/Ξ/&#926;/g;s/Ο/&#927;/g;s/Π/&#928;/g;s/Ρ/&#929;/g;s/Σ/&#931;/g;s/Τ/&#932;/g;s/Υ/&#933;/g;s/Φ/&#934;/g;s/Χ/&#935;/g;s/Ψ/&#936;/g;s/Ω/&#937;/g;s/α/&#945;/g;s/β/&#946;/g;s/γ/&#947;/g;s/δ/&#948;/g;s/ε/&#949;/g;s/ζ/&#950;/g;s/η/&#951;/g;s/θ/&#952;/g;s/ι/&#953;/g;s/κ/&#954;/g;s/λ/&#955;/g;s/μ/&#956;/g;s/ν/&#957;/g;s/ξ/&#958;/g;s/ο/&#959;/g;s/π/&#960;/g;s/ρ/&#961;/g;s/ς/&#962;/g;s/σ/&#963;/g;s/τ/&#964;/g;s/υ/&#965;/g;s/φ/&#966;/g;s/χ/&#967;/g;s/ψ/&#968;/g;s/ω/&#969;/g;s/ϑ/&#977;/g;s/ϒ/&#978;/g;s/ϖ/&#982;/g;s/•/&#8226;/g;s/…/&#8230;/g;s/′/&#8242;/g;s/″/&#8243;/g;s/‾/&#8254;/g;s/⁄/&#8260;/g;s/℘/&#8472;/g;s/ℑ/&#8465;/g;s/ℜ/&#8476;/g;s/™/&#8482;/g;s/ℵ/&#8501;/g;s/←/&#8592;/g;s/↑/&#8593;/g;s/→/&#8594;/g;s/↓/&#8595;/g;s/↔/&#8596;/g;s/↵/&#8629;/g;s/⇐/&#8656;/g;s/⇑/&#8657;/g;s/⇒/&#8658;/g;s/⇓/&#8659;/g;s/⇔/&#8660;/g;s/∀/&#8704;/g;s/∂/&#8706;/g;s/∃/&#8707;/g;s/∅/&#8709;/g;s/∇/&#8711;/g;s/∈/&#8712;/g;s/∉/&#8713;/g;s/∋/&#8715;/g;s/∏/&#8719;/g;s/∑/&#8721;/g;s/−/&#8722;/g;s/∗/&#8727;/g;s/√/&#8730;/g;s/∝/&#8733;/g;s/∞/&#8734;/g;s/∠/&#8736;/g;s/∧/&#8743;/g;s/∨/&#8744;/g;s/∩/&#8745;/g;s/∪/&#8746;/g;s/∫/&#8747;/g;s/∴/&#8756;/g;s/∼/&#8764;/g;s/≅/&#8773;/g;s/≈/&#8776;/g;s/≠/&#8800;/g;s/≡/&#8801;/g;s/≤/&#8804;/g;s/≥/&#8805;/g;s/⊂/&#8834;/g;s/⊃/&#8835;/g;s/⊄/&#8836;/g;s/⊆/&#8838;/g;s/⊇/&#8839;/g;s/⊕/&#8853;/g;s/⊗/&#8855;/g;s/⊥/&#8869;/g;s/⋅/&#8901;/g;s/⌈/&#8968;/g;s/⌉/&#8969;/g;s/⌊/&#8970;/g;s/⌋/&#8971;/g;s/〈/&#9001;/g;s/〉/&#9002;/g;s/◊/&#9674;/g;s/♠/&#9824;/g;s/♣/&#9827;/g;s/♥/&#9829;/g;s/♦/&#9830;/g;'