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git log --shortstat --author "user" \
| egrep "file[s] changed" \
| sed 's/changed, \([0-9]\+ deletions\)/changed, 0 insertions(+), \1/g' \
| awk '{files+=$1; inserted+=$4; deleted+=$6} END {print "files changed", files, "lines inserted:", inserted, "lines deleted:", deleted}'