File: pipe2tmpfile

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#!/bin/sh -e

keyroot=/run/user/$(id -u)
keyfile=$(mktemp -p ${keyroot})

cleanup() {
   rm -f "${keyfile}"
}

cat >$keyfile
trap "cleanup" INT TERM QUIT EXIT

replace() {
for i do 
   arg="$i"
   if [ "x$arg" == "x@@keyfile@@" ]; then
      arg="$keyfile"
   fi
   printf %s\\n "$arg" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/"
done
echo " "
}

newargs=$(replace "$@")
eval "set -- $newargs"
"${@}"