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Here are some useful configurations for bash, vim and screen. Every time I have to set myself up on a new machine, I end up copying these files from a machine where I've already got an account. I thought perhaps it'd be easier to put the settings on a webpage. If anyone else finds these useful, that's a bonus.

~/.bashrc

(snippet, not the whole file)

#colourful prompt
export PS1="\[\e[31;1m\]\u\[\e[34;1m\]@\[\e[32;1m\]\H\[\e[34;1m\]:\[\e[33;1m\]\w\[\e[34;1m\]> \[\e[0m\]"
export EDITOR=$(which vim)

~/.bash_aliases

alias ll='ls -l'
alias dull='du --max-depth=1' # similar to du -s (summary)
alias git-svn='git svn'
alias drush='/data/drush/drush.php'

~/.screenrc

# tabs / status bar at bottom of display
hardstatus alwayslastline
hardstatus string '%{= kG}[ %{G}%H %{g}][%= %{= kw}%?%-Lw%?%{r}(%{W}%n*%f %t%?(%u)%?%{r})%{w}%?%+Lw%?%?%= %{g}][%{B} %d/%m %{W}%c %{g}]'

~/.vimrc

" syntax highlighting, line numbers etc..
syntax on
set background=dark
set nu        " line numbers
set showmatch " matching brackets etc...
set incsearch " incremental search

" case sensitivity
set ic        " ignore case
set scs       " smartcase - any search with an uppercase character becomes a case sensitive search

" tabs and indentation set to 2 spaces
set tabstop=2
set shiftwidth=2
set expandtab 
" to have vim swap all existing tabs for 2 spaces, uncomment this
" :retab

" auto-indenting
set cindent
set smartindent
set autoindent

" file types
" recognise various drupal file extensions
" as php files for syntax highlighting
au BufReadPost *.module    set syntax=php
au BufReadPost *.install   set syntax=php
au BufReadPost *.profile   set syntax=php
au BufReadPost *.inc       set syntax=php
au BufReadPost *.php.*     set syntax=php

xmodmaprc for a mac

...finally one I don't need often. Running linux on a mac (for example a PowerBook G4 12" that I borrowed for a while recently), I find I'm a bit lost - particularly in vim - without my delete and insert keys. On the other hand, I know of no good use for the two keys to the right of the spacebar (apple key and enter?). So, I use xmodmap to map these keys to something useful:

xmodmap -e "keysym KP_Enter = Insert"
xmodmap -e "keysym Super_L = Delete"