African Proverbs

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A cutting word is worse than a bowstring, a cut may heal, but the cut of the tongue does not. If you climb up a tree, you must climb down the same tree. Don’t set sail on someone else’s star. There are no shortcuts to the top of the palm tree. When a needle falls … Read more

Copyright Term and the Public Domain in the United States

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https://copyright.cornell.edu/publicdomain Never Published, Never Registered Works Type of Work Copyright Term In the public domain in the U.S. as of 1 January 2021 3 Unpublished works Life of the author + 70 years Works from authors who died before 1951 Unpublished anonymous and pseudonymous works, and works made for hire (corporate authorship) 120 years from … Read more

What OS version and Architecture is android running ?

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ARM vs. x86 ARM: This is a mobile processor architecture first and foremost, and what the majority of phones run now. Qualcomm’s Snapdragon, Samsung’s Exynos, and MediaTek’s mobile chips are all examples of ARM processors. Most modern chips are 64-bit, or ARM64. x86: This is the architecture specification for Intel chips. As dominant as Intel is … Read more

Send only Postfix SMTP

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Find inet_interfaces parameter and change it to loopback-only. With that parameter, Postfix will not listen for any connections. vi /etc/postfix/main.cf Change the following : inet_interfaces = loopback-only

Centos what firewall is running

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Firewalld is the default firewall manager on CentOS sudo systemctl status firewalld # firewall-cmd –get-zones block dmz drop external home internal nm-shared public trusted work # firewall-cmd –get-default-zone public # firewall-cmd –get-active-zones public interfaces: eth1 eth0 # firewall-cmd –list-all public (active) target: default icmp-block-inversion: no interfaces: eth0 eth1 sources: services: cockpit dhcpv6-client http https ssh ports: … Read more