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Shell scripting

Download busybox.exe from https://frippery.org/busybox/.
Create C:\opt\bin
Copy busybox.exe to C:\opt\bin
Start busybox.exe

C:\opt\bin\busybox.exe sh -l

Merging CSV files in the current directory

first=1
for i in *.csv; do
  if [ "$i" = "merged.csv" ]; then
    continue
  fi
  if [ $first -eq 1 ]; then
    cat "$i"
    first=0
  else
    tail -n +2 "$i"
  fi
done > merged.csv