#!/bin/sh
if [ $# -eq 0 ]; then
    echo "usage: jpegconv file ..." >&2
    exit 1
fi
tmpfile=$(mktemp ~/.jpegconv.XXXXXX) || exit 1
for f in "$@"; do
    jpegtran "$f" >$tmpfile || { rm -f $tmpfile; exit 1; }
    mv -f $tmpfile "$f" && chmod go+r "$f"
done
.