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#!/usr/bin/env sh
# Description: Toggle mount status of a device using pmount
# If the device is not mounted, it will be mounted.
# If the device is mounted, it will be unmounted and powered down.
#
# Runs `lsblk` if 'l' is entered, exits on 'Return`.
#
# Note:
# - The script uses Linux-specific lsblk to list block devices. Alternatives:
# macOS: "diskutil list"
# BSD: "geom disk list"
# - The script uses udisksctl (from udisks2) to pwoer down devices. This is also Linux-specific.
# Users on non-Linux platforms can comment it and use an alterntive to power-down disks.
#
# Shell: POSIX compliant
# Author: Arun Prakash Jana
prompt="device name ['l' lists]: "
lsblk
echo
echo "Make sure you aren't still in the mounted device."
echo -n "$prompt"
read dev
while ! [ -z "$dev" ]
do
if [ "$dev" = "l" ]; then
lsblk
elif [ "$dev" = "q" ]; then
exit
else
if grep -qs "$dev " /proc/mounts; then
sync
pumount "$dev"
if [ "$?" -eq "0" ]; then
echo "$dev" unmounted.
udisksctl power-off -b /dev/"$dev"
if [ "$?" -eq "0" ]; then
echo "$dev" ejected.
fi
fi
else
pmount "$dev"
echo "$dev" mounted to "$(lsblk -n /dev/"$dev" | rev | cut -d' ' -f1 | rev)".
fi
fi
echo
echo -n "$prompt"
read dev
done
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