Further help improvements: Show command aliases in 'hg help something', unless in quiet mode. Show short command description with 'hg help -q something'. Show global options in verbose mode of command help. State that Mercurial is a Distributed SCM.

#!/bin/sh

hg init
touch a
hg add a
hg ci -m "a" -d "0 0"

echo 123 > b
hg add b
hg diff | sed "s/\(\(---\|+++\) [a-zA-Z0-9_/.-]*\).*/\1/"

hg diff -r tip | sed "s/\(\(---\|+++\) [a-zA-Z0-9_/.-]*\).*/\1/"