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rc/sh/similar

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#!/usr/bin/env sh
# YES_ZSH
# YES_BASH
# YES_DASH
similar() {
[ $# -eq 0 ] || { printf "%s\n" "$0: does not take arguments" >&2; return 1; }
awk '
{
i=0
split($0,a,"")
split(L,b,"")
for (c in a)
if (a[c]==b[c]) i++
else break
#print substr($0,1,i) "\033[7m" substr($0,i+1) "\033[0m"
print "\033[31m" substr($0,1,i) "\033[0m" substr($0,i+1)
L=$0
}'
}
[ "${SOURCING:-0}" -gt 0 ] || similar "$@"