Sunday, July 16, 2017

Bash Options Handler

#!/usr/bin/env bash

#############################################################################
###########################################################################
### Created by A.M.Danischewski (c) 2017+ v1.00
### Issues: If you find any issues emai1 me at my <first name> dot 
###         <my last name> at gmail dot com.  
###
### This is a simple effective options handler, that easily and 
### automatically handles long and short options. Hack away at it! =) 
### 
### E.g. options_handler.bsh -e e_value -l --super s_value of default 
###      options_handler.bsh --extended e_value dispersed -l -s s_value default value 
### This program is free software: you can redistribute it and/or modify. 
###########################################################################
#############################################################################

declare -a OPTIONS
declare -A OPTIONVALUES
declare -i DEFAULT_OPTION_SET=0 
declare -r DEFAULT_INDEX="default"

 ### This is a commandline options handler, it loads two arrays the first 
 ### array OPTIONS holds the OPTION FLAGS that were passed. The second 
 ### array is an associative array that holds option arguments if any 
 ### that were passed in. 
 ### Note: This handler does not accept spaces in long option names. 
function process_options() { 
while (($#>0)); do
case "$1" in
    -e|--extended)
    OPTIONS+=("-e")
     ## No argument option. 
    #[[ ! "$2" =~ ^- ]] && OPTIONVALUES["-e"]="$2" && shift 
    ;;
    -s|--super)
    OPTIONS+=("-s")
    [[ ! "$2" =~ ^- ]] && OPTIONVALUES["-s"]="$2" && shift 
    ;;
    -l|--longoption)
    OPTIONS+=("-l")
    [[ ! "$2" =~ ^- ]] && OPTIONVALUES["-l"]="$2" && shift 
    ;;
    --default)
    ;&
    *)
    if [[ "$1" =~ ^- ]]; then ## Handle unexpected options. 
       echo "*** Error option $1 not found" >&2 
       ## Add your logic. 
       shift 
    fi 
    ## Handle the default argument. 
    ((! ${DEFAULT_OPTION_SET})) && OPTIONS+=("${DEFAULT_INDEX}") && DEFAULT_OPTION_SET=1
    while [[ ! "$1" =~ ^- ]] && [[ $# -gt 0 ]]; do ## Look ma, no quotes. o_0
     OPTIONVALUES["${DEFAULT_INDEX}"]+=" ${1}" && shift
    done 
    [[ "$1" =~ ^- ]] && continue ## We have a flag again, skip shifting. 
    ;;
esac
shift ## Shift to next option. 
done
} 

function print_options() { 
for a in ${OPTIONS[@]}; do 
 echo "Got: $a with arg: ${OPTIONVALUES[${a}]}"
done   
}

process_options "$@" 
print_options
exit 0 

Sunday, June 25, 2017

Dual Booting - Ubuntu w/Windows 10 Easy

How to dual boot an existing Windows 10 with an external hard drive.

Tested on the ASUS E200HA / Windows 10 / Ubuntu 17.04. 

First download and create a bootable USB drive with Ubuntu 17.04 (tested)
or whatever your favorite Linux distro that has UEFI support is;
this tutorial will reference Debian commands, map them as necessary.

Step 1 - Enter the BIOS - Keep tapping F2 when the computer first starts -- otherwise, if it still boots Windows 10 go to Settings->Update & security->
Recovery->Advanced startup->Restart Now ->Troubleshoot->Advanced Options->UEFI Firmware Settings->Restart

Step 2 - In the BIOS, disable Fast Boot and disable Windows from the
Boot Priority List (anything else or bust)

Step 3 - Insert the USB and when the computer starts enter the BIOS
(hit F2 when starting on the Asus E200HA) Select from the
Override Boot Manager options the USB stick and boot your Linux distro,
get wifi set up and run $> sudo apt-get update

Step 4 - Attach the external hard drive, format as necessary with an
ext 4 partition for the Linux installation, or you can wait and allow
the installation software do it for you.

Step 5 - Install Linux to the external hard drive, on the screen where
it asks where you want to put the software on the Ubuntu installation
install workflow -- select SOMETHING ELSE (so you can get to the disk
formatting screens) IMPORTANT -- where it says "Device for bootloader
installation", look at the list of drives above and select from the drop
down list the same partition that has the label in the list above of
Windows Boot Manager efi. That's the partition we need to install our
bootloader to. Make sure you have at least one formatted ext4 partition
and have the mount point /. Finish installing Linux to your external
hard drive.

Step 6 - After the installation completes, type $> mount to see where
your external hard drive is mounted if it's not /target, then unmount it
$> sudo umount /dev/sda1 (if that's what it is). If it's not already mounted
on /target create a new directory on the root /:
Note: If you created other partitions make sure to unmount them and move
all the mounts to under /target (so the chroot kernel can see them).
$> sudo mkdir -p /target
Then mount sda on /target:
$> sudo mount /dev/sda1 /target
Then bind mount the critical directories:
$> for a in /sys /proc /run /dev; do sudo mount --bind "$a" "/target${a}"; done
Then mount the EFI directory, use gparted to locate the
Windows Boot Manager efi partition :
$> sudo mount /dev/sdXY /target/boot/efi
Chroot to the new install:
$> sudo chroot /target
On chroot:
$> sudo apt-get update
$> sudo apt-get install grub2
$> sudo update-grub2
$> exit
Reboot:
$> echo Cross fingers =\) && reboot

Step 7 -- Quickly yank the USB thumbdrive out before the computer gets
started (to make sure the USB hardware addresses don't screw anything
up). Your computer should hopefully automatically bring you back into
Ubuntu this time on the external hard drive no longer the USB thumbdrive.
Re-run an update of grub2:
$> sudo apt-get update
$> sudo update-grub2
DONE.

Step 8 - You should now be able to reboot with the external hardrive attached and it will go to the Ubuntu Grub2 bootloader, thereafter that you can select Windows Boot Manager and get into Windows 10 if you need to. If you don't have your external hard drive then you can still get to Windows 10 by going into the BIOS (hit F2) and select from the Boot Override options the Windows Boot Manager. Enjoy.

Wednesday, February 8, 2017

Grab Rickroll Images - Quick w/out the Clicks

#!/usr/bin/env bash 
#############################################################################
###########################################################################
### Created by A.M.Danischewski (c) 2017+ v1.00
### Issues: If you find any issues emai1 me at my <first name> dot 
###         <my last name> at gmail dot com.  
###
### This is a simple program intended to grab the oft rickroll'd images from 
### those sensationalist click-through image sites. 
### 
### This program requires (to work to full capacity) by default: 
### curl, wget, sed, grep, uniq, sort
### 
### This program is free software: you can redistribute it and/or modify
### it under the terms of the GNU General Public License as published by
### the Free Software Foundation, either version 3 of the License, or
### (at your option) any later version.
###
### This program is distributed in the hope that it will be useful,
### but WITHOUT ANY WARRANTY; without even the implied warranty of
### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
### GNU General Public License for more details.
###
### You should have received a copy of the GNU General Public License
### along with this program.  If not, see <http://www.gnu.org/licenses/>.
###########################################################################
#############################################################################
url="${1:-http://allrookie.com/perfectly-timed-sports-moments-to-pump-you-up-for-the-upcoming-olympics/}"
html_prefix="${2:-rickroll}_"
master_file="${html_prefix}_master.txt"
start_index=${3:-1}
end_index=${4:-30}
cleanup_flag=${5:-1}

 ## Get all pages 
for((a=${start_index};a<=${end_index};a++)); do 
 echo "Fetching: ${url%/}/${a}/  -->  ${html_prefix}${a}.html ..."
 curl -A mozilla -s "${url%/}/${a}/" > ${html_prefix}${a}.html
done

 ## Get all image links 
while read b; do  
 sed 's/http/\nhttp/g' "${b}" | sed -r 's/(^.{250})(.*)/\1/g' | grep "^http" | sed -r 's/(PNG|GIF|JPEG|JPG)(.*)/\1/ig' | grep -Ei "(PNG|GIF|JPEG|JPG)$" >> "${master_file}.tmp" 
done < <(ls ${html_prefix}*html)

 ## Uniq and sort the image links 
sort "${master_file}.tmp" | uniq > "${master_file}"
rm -v "${master_file}.tmp"

 ## Fetch image links 
while read c; do 
 wget --tries=3 -E -e robots=off -nc --random-wait --content-disposition --no-check-certificate -p --restrict-file-names=windows,lowercase,ascii --header "User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.$(($RANDOM%10))) Gecko/20100101 Firefox/19.0" -nd "${c}"
done < "${master_file}" 

((${cleanup_flag})) && rm -v "${html_prefix}"*html

exit 0