Say I only need the first 5 lines of an output for logging purposes. I also need to know if and when the log has been truncated.

I am trying to use `head` to do the job, the `seq` command below outputs 20 lines that get truncated by `head`, and I `echo` a truncating information:

     > seq -f 'log line %.0f' 20 | head -n 5 && echo '...Output truncated. Only showing first 5 lines...'
    log line 1
    log line 2
    log line 3
    log line 4
    log line 5
    ...Output truncated. Only showing first 5 lines...

But if the `seq` command outputs less than 5 lines, using the same above construction, I get a wrong "truncated" status:

    seq -f ' log line %.0f' 3 | head -n 5 && echo '...Output truncated. Only showing first 5 lines...'
    log line 1
    log line 2
    log line 3
    ...Output truncated. Only showing first 5 lines...

**Is there a way for the `head` command (or another tool) to tell me if it truncated anything so that I only display the "...truncated..." message when needed?**