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

mkdir a
cd a
hg init
echo 123 > a
hg add a
hg commit -m "a" -u a -d "0 0"

cd ..
mkdir b
cd b
hg init 
echo 321 > b
hg add b
hg commit -m "b" -u b -d "0 0"

hg pull ../a
hg heads