1 mkdir a
2 cd a
3 hg init
4 echo 123 > a
5 hg add a
6 hg commit -t "a" -u a -d "0 0"
7
8 cd ..
9 mkdir b
10 cd b
11 hg init
12 echo 321 > b
13 hg add b
14 hg commit -t "b" -u b -d "0 0"
15
16 hg pull ../a
17 hg heads