foozy@708: $ \textbf{cat .hg/hgrc}
foozy@708: [hooks]
foozy@708: pretxncommit.whitespace = .hg/check_whitespace.py
foozy@708: $ \textbf{echo 'a ' >> a}
foozy@708: $ \textbf{hg commit -A -m 'add new line with trailing whitespace'}
foozy@708: a, line 2: trailing whitespace added
foozy@708: commit message saved to .hg/commit.save
foozy@708: transaction abort!
foozy@708: rollback completed
foozy@708: abort: pretxncommit.whitespace hook exited with status 1
foozy@708: $ \textbf{sed -i 's, *$,,' a}
foozy@708: $ \textbf{hg commit -A -m 'trimmed trailing whitespace'}
foozy@708: a, line 2: trailing whitespace added
foozy@708: commit message saved to .hg/commit.save
foozy@708: transaction abort!
foozy@708: rollback completed
foozy@708: abort: pretxncommit.whitespace hook exited with status 1