Install Magerun, restrict to one user, and create alias.

installMagerun.sh

#!/bin/bash

# Install Magerun, restrict to one user, and create alias.

# Usage: installMagerun.sh [user] [path]
#   [user] defaults to current user
#   [path] defaults to current ./n98-magerun.phar

# Vars
mrUser="${1:-$(whoami)}"
mrPath="${2:-./}"

# Prepare Path
[[ "$mrPath" == *'/' || -d "$mrPath" ]] && mrPath="${mrPath%/}/n98-magerun.phar"
mrPath=$(readlink -f $mrPath)
mkdir -p "$(dirname $mrPath)"
rm -f "$mrPath"

# Download and Set Permissions
echo "Installing Magerun to $mrPath for $mrUser..."
curl -L "http://files.magerun.net/n98-magerun-latest.phar" -o "$mrPath" || exit 1
chown "$mrUser" "$mrPath" && chmod 500 "$mrPath" || exit 1

# Alias
if [[ $(id -u) != "0" ]]; then
    aliasFile="$HOME/.bashrc"
    [[ $(whoami) != "$mrUser" ]] && sudoStr="sudo -u $mrUser "
    [[ -f "$aliasFile" ]] && sed -i '/#n98-magerun/d' "$aliasFile"
    echo "alias magerun='$sudoStr$mrPath' #n98-magerun" >> "$aliasFile" \
      && echo "Magerun alias installed to $aliasFile"
else
    aliasFile="/etc/profile.d/magerun.sh"
    echo "alias magerun='sudo -u $mrUser $mrPath'" > "$aliasFile" \
      && echo "Magerun alias installed to $aliasFile"
fi

bash <(curl -s https://gist.githubusercontent.com/dccampbell/e090e5544333b43c2f91/raw/installMagerun.sh)
or
bash <(wget -qO- https://gist.githubusercontent.com/dccampbell/e090e5544333b43c2f91/raw/installMagerun.sh)