find the last commit that touched a file

last-used.sh

#!/bin/sh

commit=HEAD
pathspec=

git log --format='%H%n  %s' --name-status --no-merges --no-renames $commit -- $pathspec |
perl -e '
while(<>) {
	if (/^[0-9a-f]{40}$/) {
		$sha1 = $&;
	}
	elsif (/^  (.*)/) {
		$subject = $1;
	}
	elsif (/^.\t(.*)/) {
		$last{$1} = [$sha1, $subject]
			unless exists $last{$1};
	}
}

foreach my $file (sort keys(%last)) {
	print join(" ", $file, @{$last{$file}}), "\n";
}'