If you view commit history in Github, eg, it will indicate using ellipsis which commit message have additional lines of content beyond their subject line:

When using:
git log --oneline
in the terminal, is there any way to get a similar "more content" indicator?
--oneline is a standard (and very handy) shortcut format, but for anything more specific, you can rely on --pretty and build your output.
Try this pretty format (doc)
git log --pretty=format:"%h %d %s%<(1,trunc)% b%-"
%h shows the short-form hash;%d shows the decorations (branches, tags, and HEAD);%s shows the subject;%<(1,trunc) truncates the body (% b) to .. if there's one;%- removes unwanted empty lines that are appended as the result of truncating the body.Coloring
If you don't want to lose the automatic coloring of --oneline, you can replicate the most part with %C(<color>) (doc)
git log --pretty=format:"%C(yellow)%h %C(auto)%d %C(reset)%s%C(red)%<(1,trunc)% b%-"
Alias
Of course with such formats, since nobody wants to type that each time, it's nearly mandatory to make it an alias
git config --global alias.line 'git log --pretty=format:"%C(yellow)%h %C(red)%d %C(reset)%s%C(red)%<(1,trunc)% b%-"'
# which combines well with most options
git line
git line -10
git line --all --graph
(finally, you can also put the -10 or any other value as a default in the shortcut, it'll be used unless you override it explicitly, very handy)
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