[Trisquel-users] Re : Separating hostnames having multiple IPv4 addresses from a long two-column list

[lcerf]

If you attach a small excerpt of the text input(s) (save the speardsheet in  
CSV, if that is all you have), covering all "cases", and the expected output,  
I may better understand what you want to achieve and write you a command  
line.  'uniq' has an option --unique (-u) to only display unique lines.  But  
it looks like you want 'comm', which compares two (sorted) files and show the  
lines appearing in both.