Amazon Linux システムに RPM キーをインストールするにはどうすればよいですか?

私はAmazon Linuxを使用しています。ユネーム情報です

[myuser@mymachine3 ~]$ uname -a
Linux mymachine3 4.8.18-12.31.amzn1.x86_64 #1 SMP Thu Jun 22 06:20:54 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

RPMのインストールに必要なキーの取得に問題があります。私がやっていることと私が受け取るエラーは次のとおりです。

[myuser@mymachine3 ~]$ wget https://dl-ssl.google.com/linux/linux_signing_key.pub
--2017-08-25 14:38:31--  https://dl-ssl.google.com/linux/linux_signing_key.pub
Resolving dl-ssl.google.com (dl-ssl.google.com)... 173.194.206.93, 173.194.206.136, 173.194.206.190, ...
Connecting to dl-ssl.google.com (dl-ssl.google.com)|173.194.206.93|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 8038 (7.8K) [application/octet-stream]
Saving to: ‘linux_signing_key.pub’

linux_signing_key.pub                              100%[================================================================================================================>]   7.85K  --.-KB/s    in 0s

2017-08-25 14:38:31 (71.2 MB/s) - ‘linux_signing_key.pub’ saved [8038/8038]

[myuser@mymachine3 ~]$ sudo rpm –import linux_signing_key.pub
[sudo] password for myuser:
RPM version 4.11.3
Copyright (C) 1998-2002 - Red Hat, Inc.
This program may be freely redistributed under the terms of the GNU GPL

Usage: rpm [-aKfgpqVcdLilsiv?] [-a|--all] [-f|--file] [-g|--group] [-p|--package] [--pkgid] [--hdrid] [--triggeredby] [--whatrequires] [--whatprovides] [--nomanifest] [-c|--configfiles]
        [-d|--docfiles] [-L|--licensefiles] [--dump] [-l|--list] [--queryformat=QUERYFORMAT] [-s|--state] [--nofiledigest] [--nofiles] [--nodeps] [--noscript] [--allfiles] [--allmatches]
        [--badreloc] [-e|--erase <package>+] [--excludedocs] [--excludepath=<path>] [--force] [-F|--freshen <packagefile>+] [-h|--hash] [--ignorearch] [--ignoreos] [--ignoresize] [-i|--install]
        [--justdb] [--nodeps] [--nofiledigest] [--nocontexts] [--noorder] [--noscripts] [--notriggers] [--nocollections] [--oldpackage] [--percent] [--prefix=<dir>] [--relocate=<old>=<new>]
        [--replacefiles] [--replacepkgs] [--test] [-U|--upgrade <packagefile>+] [-D|--define 'MACRO EXPR'] [--undefine=MACRO] [-E|--eval 'EXPR'] [--macros=<FILE:...>] [--noplugins] [--nodigest]
        [--nosignature] [--rcfile=<FILE:...>] [-r|--root ROOT] [--dbpath=DIRECTORY] [--querytags] [--showrc] [--quiet] [-v|--verbose] [--version] [-?|--help] [--usage] [--scripts] [--setperms]
        [--setugids] [--conflicts] [--obsoletes] [--provides] [--requires] [--info] [--changelog] [--xml] [--triggers] [--last] [--dupes] [--filesbypkg] [--fileclass] [--filecolor]
        [--fscontext] [--fileprovide] [--filerequire] [--filecaps]

私のシステムからキーを取得する正しい方法は何ですか？