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#!/bin/sh
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# Filters `map` error messages
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selfDir="$(dirname -- "$0")"
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if ! test "$#" -ge 1; then
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    echo "Usage: env [n=... (\"\" for all)] $0 grep-options... <input"\
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    |fold -s >&2
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    exit 2
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fi
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test -n "${n+t}" || n=1
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"$selfDir/filter_errors_before"|grep "$@"|\
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$(test -n "$n" && echo head -"$n" || echo cat)|"$selfDir/filter_errors_after"
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