meaning of icons

[norman]

< snip >

> in the console try these in the following order:
> - sudo su
>     [followed by your password]
> - mytharchivehelper /var/lib/mythtv/recordings/file_name.extension
>     [replace the file_name.extension with the name of the recording you 
> want to edit]

Great that worked, so far so good. Now what I am trying to do is to
extract a single frame from a video. To do that I will use
mytharchivehelper -t infile secs outfile
where secs is the number of seconds into the video where the frame
appears.

Where in the sequence of things does this fit in the expression you
gave?

Norman