`yes` in ubuntu

Question

How to include hyphen or dash ( - ) character as argument yes in Ubuntu?

In FreeBSD, I can do this:

 $ yes "-tcp" | head -n 2 -tcp -tcp 

But on Ubuntu, I get an error:

 $ yes "-tcp" | head -n 2 yes: invalid option -- 't' Try `yes --help' for more information. 

Answer 1

I think this will work:

 $ yes -- "-tcp" | head -n 2 

A double dash says yes to stop parsing options.

Answer 2

Use yes -- -tcp . -- stop processing arguments.

 noufal@sanitarium % yes -- "-tcp" | head -n 2 -tcp -tcp 

Answer 3

From info yes :

For output, an argument starting with -', precede it with -', for example, `yes - --help '

So you want:

 yes -- -tcp | head -n 2