This file is indexed.

/usr/share/irssi/help/silence is in irssi 0.8.17-1+deb8u5.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
%9Syntax:%9

SILENCE %|[[+|-]<nick!user@host>]
SILENCE %|[<nick>]

%9Parameters:%9

    The nickname or hostname to silence; you must prepend it by the '+' or '-'
    character to indicate whether the entry should be added or removed.

    If no arguments are given, the list of silence entries will be displayed.

%9Description:%9

    Manages the server side ignore list; users or hostnames that match an entry
    on the list are not able to send you any messages or invites.

    This command does not work on all IRC networks.

%9Examples:%9

    /SILENCE
    /SILENCE +mike
    /SILENCE -mike
    /SILENCE +*!*@*.irssi.org
    /SILENCE -*!*@*.irssi.org

%9See also:%9 ACCEPT, IGNORE