Ways to install node.js in bash

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#!/usr/bin/env bash

#
# Inspired by:
#   https://github.com/visionmedia/n/blob/master/bin/n
#   http://stackoverflow.com/a/8597411
#

# Detect Platform
if [[ "$OSTYPE" == "linux-gnu" ]]; then
   PLATFORM=linux
elif [[ "$OSTYPE" == "darwin"* ]]; then
   PLATFORM=darwin
elif [[ "$OSTYPE" == "win32" ]]; then
   echo "Windows not supported"
   exit 1
else
   echo "Unknown or unsupported platform, defaulting to linux"
   PLATFORM=linux
fi

# Detect Architecture
if [[ "$(arch)" == "x86_64" ]]; then
   ARCH=x64
elif [[ "$(arch)" == "i386" ]]; then
   ARCH=x86
else
   echo "Unknown Architecture, defaulting to x86"
   ARCH=x86
fi

# Get latest stable version
GET=
command -v wget > /dev/null && GET="wget --no-check-certificate -q -O-"
command -v curl > /dev/null && GET="curl -# -L"
test -z "$GET" && abort "curl or wget required"
if [[ -z "$GET" ]]; then
   echo "Could not get version, defaulting to 0.10.29"
   VERSION=0.10.29
else
   VERSION=`$GET 2> /dev/null http://nodejs.org/dist/ | egrep -o '[0-9]+\.[0-9]*[02468]\.[0-9]+' | sort -u -k 1,1n -k 2,2n -k 3,3n -t . | tail -n1`
fi

# Get latest stable version
GET=
command -v wget > /dev/null && GET="wget --no-check-certificate -q -O-"
command -v curl > /dev/null && GET="curl -# -L"
test -z "$GET" && abort "curl or wget required"
if [[ -z "$GET" ]]; then
   echo "Could not get version, defaulting to 0.10.29"
   VERSION=0.10.29
else
   VERSION=`$GET 2> /dev/null http://nodejs.org/dist/ | egrep -o '[0-9]+\.[0-9]*[02468]\.[0-9]+' | sort -u -k 1,1n -k 2,2n -k 3,3n -t . | tail -n1`
fi

# Install location
PREFIX=${N_PREFIX-/usr/local}

if [ "$(which node)" == "" ] || [ "$(node -v)" != "v$VERSION" ]; then
   echo "==============================="
   echo "Installing Node"
   echo "==============================="
   mkdir -p "$PREFIX"
   curl http://nodejs.org/dist/v$VERSION/node-v$VERSION-$PLATFORM-$ARCH.tar.gz | tar xzvf - --strip-components=1 -C "$PREFIX"
   rm $PREFIX/ChangeLog $PREFIX/LICENSE $PREFIX/README.md
   node -e "console.log('Node v$VERSION successfully installed!')"
else
   node -e "console.log('Node v$VERSION already installed!')"
fi

n

#!/usr/bin/env bash

GET=
command -v wget > /dev/null && GET="wget -q"
test -z "$GET" && abort "wget required"

PREFIX=${N_PREFIX-/usr/local}
$GET https://raw.githubusercontent.com/visionmedia/n/master/bin/n -O $PREFIX/bin/n && chmod +x $PREFIX/bin/n
n stable 2> /dev/null
node -e "console.log('Node ' + process.version + ' successfully installed!')"