Clean way to launch the web browser from shell script?

python -mwebbrowser http://example.com

works on many platforms

xdg-open is standardized and should be available in most distributions.

Otherwise:

1. eval is evil, don't use it.
2. Quote your variables.
3. Use the correct test operators in the correct way.

Here is an example:

#!/bin/bash
if which xdg-open > /dev/null
then
  xdg-open URL
elif which gnome-open > /dev/null
then
  gnome-open URL
fi

Maybe this version is slightly better (still untested):

#!/bin/bash
URL=$1
[[ -x $BROWSER ]] && exec "$BROWSER" "$URL"
path=$(which xdg-open || which gnome-open) && exec "$path" "$URL"
echo "Can't find browser"