Save a webcam picture every x seconds (suitable for a timelapse). Created on a Raspberry Pi 3 running Arch Linux.

fswebcam-loop.sh

#!/bin/bash

# Exit script if /mnt is not mounted somewhere
# Prevents filling the root filesystem (/)
if ! mountpoint /mnt ; then
    >&2 echo "Error: No mountpoint."
    exit 1
fi

# Endless loop
while true; do

    name=`date +'%Y-%m-%d_%H%M%S'`

    fswebcam -r "1280x720" -v -F 1 -S 35 --no-banner - > /mnt/$name.jpg
    cp /mnt/$name.jpg /mnt/aktuell.jpg

    echo Sleeping...
    sleep 30

done