$ source ~/.bashrc

setenv BASH_ENV /Users/DK/.env

# == Bash setup for interactive shells ==
# === Environment for all shells ===
. $BASH_ENV
# [skipped]

# == Setup for all shells ==
# This is executed for all interactive and for non-interactive shells (e.g. scripts)

shopt -s expand_aliases extglob xpg_echo

# [skipped] Misc. variables and PATH setup

# === General aliases ===

alias pause='echo "Press [Return] or [Enter] to continue..."; read' # read -p does not display prompt in Eclipse console

# [skipped]

#!/bin/bash -i

# Expand aliases defined in the shell ~/.bashrc
shopt -s expand_aliases

your_cool_alias: command not found

For almost every purpose, aliases are superseded by shell functions.

petsc() {
    ~/petsc-3.2-p6/petsc-arch/bin/mpiexec "$@"
}
export -f petsc