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rc/sh/similar

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#!/usr/bin/env sh
# YES_ZSH
# YES_BASH
# YES_DASH
# YES_ASH
# YES_BB_AWK
similar() { ### @-
### highlight adjacent lines up to the first inequivalent character.
[ $# -eq 0 ] || { printf "%s\n" "$0: does not take arguments" >&2; return 1; }
awk '
{
i=0
for(c=1;c<length;c++)
if(substr($0,c,1)==substr(L,c,1)) 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=$0
}'
}
[ -n "${preload+-}" ] || similar "$@"