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nix-shared/pkgs/tb-scripts/xz

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#!/bin/sh -x
PROCS=$(grep -c ^processor /proc/cpuinfo)
if [ $# -eq 0 ]; then
(for f in *; do
echo "$f";
done) | xargs -P"$PROCS" -d'\n' -n1 xz -9ve
else
(for f in "$@"; do
echo "$f";
done) | xargs -P"$PROCS" -d'\n' -n1 xz -9ve
fi