install-bash-sh

#!/bin/sh
# package:		Part of VPL-Jail-System
# copyright:    Copyright (C) 2014 Juan Carlos Rodriguez-del-Pino
# license:      GNU/GPL, see LICENSE.txt or http://www.gnu.org/licenses/gpl.txt
# Description:  Script to install bash

if [ -x "$(command -v bash)" ] ; then
	exit 0
fi

# Fixes UID if needed
if [ -z "$UID" ] ; then
	UID=$(id -u)
	EUID=$(id -u -r)
fi
# Checks running as root
if [ "$UID" != "0" ] && [ "$EUID" != "0" ] ; then
	echo "This script need to be run as user root and is run as user $USER uid $UID euid $EUID"
	exit 1
fi

mkdir -p /var/log &> /dev/null
LOGFILE=/var/log/vpl_installation.log
touch $LOGFILE &> /dev/null
chmod 600 $LOGFILE

# Install bash after detecting package manager (DNF/APT/APK)
if [ "$(command -v dnf)" != "" ] ; then
	dnf -y install bash >> "$LOGFILE"
elif [ "$(command -v apt)" != "" ] ; then
	apt-get -q -y install bash >> "$LOGFILE"
elif [ "$(command -v apk)" != "" ] ; then
	apk add bash >> "$LOGFILE"
fi