mi-flash.sh

#!/bin/bash -e
set -o pipefail
product="$1"

(
set -x
[[ -n $product ]]
fastboot getvar product |& grep -q "$product"
)

echo
cd "$product"
mv flash_all.sh flash_all.sh.bak
tee flash_all.sh <<< "#!/bin/bash -ex"
grep "^fastboot" flash_all.sh.bak | grep -v 'getvar\|reboot' | sed -e 's/`dirname $0`\///g' -e 's#$\* ##g' | tee -a flash_all.sh

echo
read -rp "Continue? [y/N] "
if [[ ${REPLY,,} =~ ^(y|yes)$ ]]; then
    chmod +x flash_all.sh
    exec ./flash_all.sh
fi