Add -m for commit and deprecate -t
Index: hg/doc/hg.1.txt
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#!/bin/sh
hg init
echo 123 > a
hg add a
hg commit -t "first" -u test -d "0 0" a
mkdir sub
echo 321 > sub/b
hg add sub/b
hg commit -t "second" -u test -d "0 0" sub/b
cat sub/b
hg co 0
cat sub/b
ls sub
true