Create CentOS 6.6 Bootable USB Installer

create_USB-CentOS_6.6.sh

#!/bin/bash

###
# Download the ISO if not already done:
#     curl -o ~/Downloads/CentOS-6.6-x86_64-minimal.iso \
#         http://mirror.lug.udel.edu/pub/centos/6.6/isos/x86_64/CentOS-6.6-x86_64-minimal.iso
#
# Verify the ISO:
#     iso_sha256=` openssl sha256 -r ~/Downloads/CentOS-6.6-x86_64-minimal.iso | cut -d ' ' -f1`
#     [[ $iso_sha256 != '5458f357e8a55e3a866dd856896c7e0ac88e7f9220a3dd74c58a3b0acede8e4d' ]] && echo "BAD: SHA256 is incorrect!" 1>&2
#
# Determine the DISK_DEV with:
#     diskutil list

DISK_DEV=/dev/disk2
ISO_PATH=$HOME/Downloads/CentOS-6.6-x86_64-minimal.iso
IMG_PATH=$HOME/Downloads/CentOS-6.6-x86_64-minimal.img

hdiutil convert -format UDRW -o $IMG_PATH $ISO_PATH

# This is typically not necessary.  It partitions & formats the disk
# diskutil partitionDisk $DISK_DEV 1 "Free Space" "UNTITLED" "100%"

diskutil umountDisk $DISK_DEV
sudo dd if=$IMG_PATH.dmg of=$DISK_DEV bs=1m
diskutil eject $DISK_DEV

create_USB-CentOS_7.0.sh

#!/bin/bash

###
# Download the ISO if not already done:
#     curl -o ~/Downloads/CentOS-7.0-1406-x86_64-Minimal.iso \
#         http://mirror.lug.udel.edu/pub/centos/7/isos/x86_64/CentOS-7.0-1406-x86_64-Minimal.iso
#
# Verify the ISO:
#     iso_sha256=` openssl sha256 -r ~/Downloads/CentOS-7.0-1406-x86_64-Minimal.iso | cut -d ' ' -f1`
#     [[ $iso_sha256 != '04e99a4f1a013b95a7ebc9a90ffa9ac64d28eb9872bc193fbd7c581ec9b6a360' ]] && echo "BAD: SHA256 is incorrect!" 1>&2
#
# Determine the DISK_DEV with:
#     diskutil list

DISK_DEV=/dev/disk2
ISO_PATH=$HOME/Downloads/CentOS-7.0-1406-x86_64-Minimal.iso
IMG_PATH=$HOME/Downloads/CentOS-7.0-1406-x86_64-Minimal.img

hdiutil convert -format UDRW -o $IMG_PATH $ISO_PATH

# This is typically not necessary.  It partitions & formats the disk
# diskutil partitionDisk $DISK_DEV 1 "Free Space" "UNTITLED" "100%"

diskutil umountDisk $DISK_DEV
sudo dd if=$IMG_PATH.dmg of=$DISK_DEV bs=1m
diskutil eject $DISK_DEV