Nexus tools suggestions

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#!/bin/bash

ADB="/usr/bin/adb"
FASTBOOT="/usr/bin/fastboot"

# get sudo

echo "[INFO] Nexus Tools 1.2.1"
echo "[INFO] Please enter sudo password for adb/fastboot install"
sudo echo "[ OK ] Sudo access granted."

# check if already installed

if [ -f $ADB ]; then
    read -p "[INFO] ADB is already present, press ENTER to overwrite or exit to cancel."
    sudo rm $ADB
fi
if [ -f $FASTBOOT ]; then
    read -p "[INFO] Fastboot is already present, press ENTER to overwrite or exit to cancel."
    sudo rm $FASTBOOT
fi

# detect operating system and install

if [ -f "/usr/bin/old_bins/chromeos-tpm-recovery" ]; then # Chrome OS
    sudo mount -o remount,rw /
    if [ "$?" -ne "0" ]; then
        echo "[WARN] It appears your Chrome OS device is not rooted. Having root privliges is needed to install ADB and Fastboot."
        echo "[INFO] Run the following command to root" 
        echo "sudo /usr/share/vboot/bin/make_dev_ssd.sh --force --remove_rootfs_verification"
        echo " "
        exit 0
    fi
    
    if [ "$(arch)" == "arm" ]; then # Chrome OS on ARM CPU
        OS_NAME="Chrome OS ARM"
        ADB_URL="http://github.com/corbindavenport/nexus-tools/blob/master/chromeos/adb-arm?raw=true"
        FASTBOOT_URL="http://github.com/corbindavenport/nexus-tools/blob/master/chromeos/fastboot-arm?raw=true"
    else  # Chrome OS on Intel CPU
        OS_NAME="Chrome OS Intel"
        ADB_URL="http://github.com/corbindavenport/nexus-tools/blob/master/chromeos/adb-x86?raw=true"
        FASTBOOT_URL="http://github.com/corbindavenport/nexus-tools/blob/master/chromeos/fastboot-x86?raw=true"
    fi
   
elif [ "$(uname)" == "Darwin" ]; then # Mac OS X
    OS_NAME="Mac OS X"
    ADB_URL="http://github.com/corbindavenport/nexus-tools/blob/master/macosx/adb?raw=true"
    FASTBOOT_URL="http://github.com/corbindavenport/nexus-tools/blob/master/macosx/fastboot?raw=true"

elif [ "$(expr substr $(uname -s) 1 5)" == "Linux" ]; then # Linux
    OS_NAME="Linux"
    ADB_URL="http://github.com/corbindavenport/nexus-tools/blob/master/linux/adb?raw=true"
    FASTBOOT_URl="http://github.com/corbindavenport/nexus-tools/blob/master/linux/fastboot?raw=true"

elif [ "$(expr substr $(uname -s) 1 10)" == "MINGW32_NT" ]; then # Cygwin on Windows

    echo "[WARN] Nexus Tools Installer currently not compatible with Cygwin. Now exiting."
    echo " "
    exit 0

fi


if [ -n "$ADB_URL" ]; then
    # now we get the files
    echo "[INFO] Downloading tools for" $OS_NAME
    sudo curl -s -o $ADB $ADB_URL -LOk
    sudo curl -s -o $FASTBOOT $FASTBOOT_URL -LOk

    # and make them executable
    echo "[INFO] Making ADB and Fastboot executable..."
    sudo chmod +x $ADB
    sudo chmod +x $FASTBOOT
    echo "[ OK ] Done!"
    echo "[INFO] Type adb or fastboot to run."
    echo " "
    exit 0
fi

# we shouldn't get here, but just in case
echo "[WARN] Install failed..."
echo " "
exit 0