Launch an FTP server for each drive letter (MSYS2 / pyftpdlib)

ftp_servers_launch.sh

#!/bin/bash
# A problem I commonly experience on Windows is wanting to access all files via
# another computer on the network running Linux or a phone running Android.
#
# While it is technically possible to use Samba shares, this is annoying to set
# up. Usually I just spawn FTP servers. But an annoying thing about Windows is
# its concept of multiple roots. While it's also possible to "mount" a drive
# letter under C:\ in Windows I think, this is also annoying to set up.
#
# So, I use this script. Running as:
#
# $ ./ftp_servers_launch.sh risingsun
#
# Will start FTP servers for each drive letter with the password "risingsun".
# Requires MSYS2 and pyftpdlib be installed. (/usr/bin/pip3.8 install
# pyftpdlib)
#
# (3.8 is Python3 version.)

DRIVES=(a b c d e f g h i j k l m n o p q r s t u v w x y z)

if [ -z "$1" ]; then
    >&2 echo "No password supplied!"
    exit 1
fi

NUMDRIVES=0

for DRIVE in ${DRIVES[@]}; do
    if [ -d /$DRIVE ]; then
        echo /usr/bin/python3.8 -m pyftpdlib -p $((3000+$NUMDRIVES)) -d /$DRIVE/ -i 0.0.0.0 -u $DRIVE -P "$1" '&'
        /usr/bin/python3.8 -m pyftpdlib -p $((3000+$NUMDRIVES)) -d /$DRIVE/ -i 0.0.0.0 -u $DRIVE -P "$1" &
        NUMDRIVES=$((NUMDRIVES+1))
        echo Spawned : $!
    fi
done