Useful Tools (and Cool Stuff)

Every once in a while, I find and/or write some tool that makes life easier for me in one way or another and add it here. Plus, sometimes I find some cool snippets of code and figure, "Why not put 'em here?" I'd appreciate any you may have, by the way.

You should be using SuperGenPass to make "passwording" easier online. For a guarantee of security, I'd recommend the mobile version which has also been implemented for the Blackberry!.
Hide your email address from spam bots
Encrypt your web documents with simple (but weak) web encryption
Stream MP3s over the Internet
Automatically write and scroll text in a textarea HTML form control
How to beat telemarketers at their own game (take a look at an old version)
The Power of Compound Interest (take a look at an old version)
The Extended Euclidean Algorithm (take a look at an old version)
My useful Linux .bashrc additions:

alias a='alias'

alias c='clear'

alias ch='chmod'

alias d='du -chsx /*'

alias df='df -Th'

alias h='history'

alias j='jobs'

alias la='ls -A'

alias ll='ls -l'

alias ls='ls -CF --color=auto $*'

alias lss='ls -Al $*'

alias lsss='lss $* | more'

alias m='more'

alias n='netstat'

alias netstat='netstat -lnp | grep " LISTEN " | grep -v "tcp6"'

alias p='ps -ef'

alias pr='printenv'

alias rm='mv -f -t $HOME/.local/share/Trash/files $*'

alias rmdir='mv -f -t $HOME/.local/share/Trash/files $*'

alias v='vim -u ~/.vimrc'

alias ~='cd ~'

export VNC_VIA_CMD='/usr/bin/ssh -C -f -L "$L":"$H":"$R" "$G" sleep 20'

export EDITOR=/usr/bin/vim

mesg n

My .vimrc:

set nocompatible	" use vim improvements
set autoindent	" automatically indent new lines...
set smartindent	" ...smartly
set backspace=2	" allow backspace over everything
set tabstop=8	" tabs are 8 characters
set nomodeline	" don't overwrite own .vimrc
set ignorecase	" searches are case-insensitive...
set smartcase	" ...unless they contain upper-case characters
set wrapscan	" wrap searches
set hlsearch	" highlight searches...
noremap <silent> <Space> :silent noh<Bar>echo<CR>	" ...but clear them with :space:
hi search ctermbg=red ctermfg=white	" highlight searches white on red
set nowrap	" don't wrap lines
setlocal comments-=://	" don't automatically comment
set nobackup	" don't use backup files...
set nowritebackup	" ...and don't create them
set ruler	" show the cursor
set showmatch	" highlight matching brackets
set history=500	" keep 500 lines of history
syntax off	" turn off syntax highlighting
" use an informative status line...
set statusline=%F%m%r%h%w\ \[FORMAT=%{&ff}\]\ [TYPE=%Y]\ [ASCII=\%03.3b]\ [HEX=\%02.2B]\ [POS=%04l,%04v][%p%%]\ [LEN=%L]
set laststatus=2	" ...and always show it

"set gdefault	" assume /g (global) on substitutions

To force a file system check on reboot (and reboot):

$ sudo touch /forcefsck

$ sudo shutdown -r now

To mount ISOs:

$ sudo mount -o loop -t iso9660 /path/to/file.iso /path/to/mount_point

To make a color in an image transparent using ImageMagick:

$ convert -transparent "#hex_color" input_file output_file

To combine several PDFs into one:

$ gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=output.pdf file1.pdf file2.pdf

To split a PDF:

$ gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -dFirstPage=m -dLastPage=n -sOutputFile=out.pdf in.pdf

To rotate a PDF counterclockwise by 90 degrees:

$ pdftk in.pdf cat 1-endwest output out.pdf

To prevent key passphrases to be continuously prompted for in ssh sessions (once logged in via ssh):

$ exec ssh-agent bash

$ ssh-add

To list duplicate files by hash:

$ find -not -empty -type f -printf "%s\n" | sort -rn | uniq -d | xargs -I{} -n1 find -type f -size {}c -print0 | xargs -0 md5sum \

| sort | uniq -w32 --all-repeated=separate

To rotate a video clockwise 90 degrees:

$ ffmpeg -i <input_video> -vf "transpose=1" -r 30 -sameq <output_video>