[Feature Request] Support for line number seeking

[sparrc]

Thanks for the excellent library :),

I want to request support for seeking by line number, as in the linux tail command:

-n, --lines=[+]NUM
              output the last NUM lines, instead of the last 10; or use -n
              +NUM to output starting with line NUM

Both options would be useful, I know that Go doesn't natively support seeking files by line number, but could probably come up with something fairly efficient, like:

• --lines=+n, read from beginning of file until you read n-1 newlines, then start from there.
• --lines=n, read from end of file until you read n newlines, the start from there.

If I find some time I'll try to work on this, and will update the issue if I do.

[edigu]

Seeking by line number feature would awesome.

[Nino-K]

@sparrc and @edigu I will add this to the backlog, meanwhile any related PR is welcomed.

[pavel-odintsov]

Yes, will be nice to have option to limit number of lines in output!

[bharatkrishna]

When implemented, what's mentioned by @sparrc can be used without -f right? I.e. as in the linux tail command where it'll just print out last n lines without following the file.

[tony-harverson-moonpig]

@Nino-K do either of the PRs referenced above look like something that might be accepted?

[gen2brain]

What is the status of this feature request? I see a couple of pull requests, is there a known issue with those, does anyone use them?