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rc/sh/sv

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#!/usr/bin/env sh
# YES_ZSH
# YES_BASH
# YES_DASH
sv() { ### @-
### collect the lastmost value of every key.
### the field separator can be given as its sole argument.
###
### ```
### echo "this=that\nthem=those\nthis=cat" | sv =
### this=cat
### them=those
### ```
###
### **TODO:** add multi-file grep example.
[ $# -le 1 ] || { printf "%s\n" "$0: too many arguments" >&2; return 1; }
awk "-F${1:- }" '
NF>1{f[$1]=substr($0,length($1)+1+length(FS))}END{for(k in f)print k FS f[k]}
'
}
[ "${SOURCING:-0}" -gt 0 ] || sv "$@"