ches's github alias modified for Linux

snippet.sh

# Bash alias to open Github page for project in current working directory.
# Will use the current active branch if it exists remotely, or falls back to master.

alias github='br=$(git branch --contains HEAD | sed -rn "s/^\* //p"); if ! git ls-remote . | grep -q -e "refs/remotes/.*/${br}"; then br="master"; fi; xdg-open $(git config -l | sed -rn "s%remote.origin.url=git(@|://)(github.com)(:|/)(.+/.+).git%https://\2/\4/tree/${br}%p")'