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#!/bin/bash
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# Runs a command, taking input from the concatenation of the given files
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# Usage: env [cat=...] self file... -- command args...
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test -n "$cat" || cat=cat
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files=()
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while test "$#" -ge 0; do
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    if test "$1" = --; then
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        shift
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        break
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    fi
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    files=("${files[@]}" "$1")
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    shift
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done
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"$cat" "${files[@]}"|"$@"
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