plotall.sh

#!/bin/bash
{ list=( [0-9]*.csv ); head -n 1 "${list[1]}" & tail -q -n +2 "${list[@]}"; } > merged.csv

num=$(echo $(head -n 1 merged.csv | wc -c) - $(head -n 1 merged.csv  | tr -d ';' | wc -c) | bc)
echo ${num}

mkdir plots

for i in $(seq 2 $num)
do
    name=$(eval "head -n 1 merged.csv | cut -d\";\" -f $i")
    echo $name
    gnuplot << EOF
    set terminal png
    set output "plots/$name.png"
    set datafile separator ';'
    set timefmt "%d.%m.%Y %H:%M:%S"
    set xdata time

    plot 'merged.csv' u 1:$i w l title columnhead
EOF
done