$ \textbf{export HGMERGE=merge}
$ \textbf{hg merge}
merging letter.txt
merge: warning: conflicts during merge
merging letter.txt failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
There are unresolved merges, you can redo the full merge using:
  hg update -C 1
  hg merge 2
$ \textbf{cat letter.txt}
Greetings!

I am Shehu Musa Abacha, cousin to the former
=======
I am Alhaji Abba Abacha, son of the former

Nigerian dictator Sani Abacha.