When hg is invoked without parameters, the short list help is displayed. When hg is executed without parameters ( or hg is executed with the 'help shortlist' command ) the short help list is displayed. If the 'help' command is passed on the commandline the full help list is displayed. In both the cases if the switch '-v' is passed, the help contains also the aliases of the short/full commands list and the global switches.

#!/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