Check out available updates for virtual environment or system libraries with pip

pip-list-updates.sh

#!/bin/bash
#
# Check out available updates for virtual environment or system libraries with
# `pip <http://pip.pypa.org/>`_.
#
# Requirements
# ============
#
# * GNU/Linux, Mac OS X
# * `pip`_ 1.4 or higher
#
# Installation
# ============
#
# Just put ``pip-list-updates`` somewhere to your ``$PATH`` (``~/bin`` is
# most obvious choice) and add exec guid to it with ``chmod +x``.
#
# Usage
# =====
#
# Checking available updates for virtual environment libraries::
#
#     $ cd /path/to/project  # If project contains venv dir(s)
#     $ pip-list-updates
#
# ::
#     $ workon <venv>  # If virtualenvwrapper used
#     (<venv>)$ pip-list-updates
#
# Checking available updates for system libraries::
#
#     $ pip-list-updates  # Make sure that `pwd` does not contain venv dir(s)
#
# Sort available updates by name::
#
#     $ pip-list-updates -q | sort
#

found=0
quiet=$1

for dir in `pwd`/*; do
    if [ -d "$dir" -a -f "$dir/bin/activate" ]; then
        found=1
        if [ "$quiet" != "-q" ]; then
            echo "Available updates in '`basename $dir`' virtual environment:";
        fi
        "$dir/bin/pip" list -lo
    fi
done

if [ $found -eq 0 ]; then
    if [ "$quiet" != "-q" ]; then
        if [ `python -c "import sys; print(1 if hasattr(sys, 'real_prefix') else 0);"` -eq 1 ]; then
            echo "Available updates for '`basename $(python -c 'import sys; print(sys.prefix)')`' virtual environment:";
        else
            echo "Available updates for system libraries:";
        fi
    fi
    pip list -lo
fi