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   ss    ( 8 )

еще одна утилита для исследования сокетов (another utility to investigate sockets)
  Name  |  Synopsis  |  Description  |  Options  |    State-filter    |  Expression  |  Host syntax  |  Usage example  |  See also  |

STATE-FILTER

STATE-FILTER allows to construct arbitrary set of states to
       match. Its syntax is sequence of keywords state and exclude
       followed by identifier of state.


       Available identifiers are:


              All standard TCP states: established, syn-sent, syn-recv,
              fin-wait-1, fin-wait-2, time-wait, closed, close-wait,
              last-ack, listening and closing.


              all - for all the states


              connected - all the states except for listening and closed


              synchronized - all the connected states except for syn-
              sent


              bucket - states, which are maintained as minisockets, i.e.
              time-wait and syn-recv


              big - opposite to bucket