\begin{equation} E_c = \frac{1}{2}mv^2 \end{equation} \begin{equation} e^{i \theta} = cos \theta + i\, sin \theta \end{equation}

#!/bin/bash
if [ $# -ne 1 ]; then
  echo "Usage: $0 <executable>"
  exit 1
fi
if [ -x $1 ]; then
  for i in 1 2 3 4; do
    scp $1 wolf0$i:$PWD/
  done
  exit 0
else
  echo "$1 isn't executable"
  exit 1
fi