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Using sed and filter-branch to prepend and append to Git commit messages without newlines
# Prepending text to the five most recent commit messages:
git filter-branch --msg-filter 'sed "s/\(.*\)/[prepended text] \1/g"' HEAD~5..HEAD
# Appending text to the five most recent commit messages:
git filter-branch --msg-filter 'sed "s/\(.*\)/\1 [appended text]/g"' HEAD~5..HEAD
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