Command line to stop Windows 10 updates

To stop Windows 10 updates:

> net stop wuauserv

> net stop bits

> net stop dosvc

Resume it:

> net start wuauserv

> net start bits

> net start dosvc

Ref: https://lifehacker.com/pause-windows-10-updates-easily-from-the-command-line-1786614642

Sign and verify your file using SSL / OpenSSL

I want to learn know to sign and verify my file using SSL / OpenSSL. And I'd found Enrico Zimuel has did a very nice illustration on this issue:

https://www.zimuel.it/blog/sign-and-verify-a-file-using-openssl

Add git information to your bash prompt

To show git information in your bash prompt, add the following function in your ~/.bashrc

function git-shell() {
  export GIT_PS1_SHOWDIRTYSTATE=1
  export PS1='\[\033[01;33m\] (git) \[\033[01;34m\]\w$(__git_ps1 " \[\033[01;32m\](%s)")\[\033[00m\]\n\$ '
}

Then, in your bash, run "git-shell" and you will get a nice git prompt:

 (git) /path_to_your_git_project (master *)
$ 

curl returns "ssl_choose_client_version:unsupported protocol" error in Ubuntu 20.x

If you encountered "ssl_choose_client_version:unsupported protocol" when using curl in Ubuntu 20:

    $ curl https://somehost/

 

curl: (35) error:1425F102:SSL routines:ssl_choose_client_version:unsupported protocol

It may because the "somehost" only accepts old protocol (e.g. TLS v1, etc.), but in Ubuntu 20.x, the OpenSSL assumes minimum = TLS v1.2 by default. 

If the "somehost" just cannot upgrade to TLS v1.2, you might consider fixing it with the following:

1) Modify /etc/ssl/openssl.cnf

Search for the line "oid_section = new_oids"

Add the following lines below it:

openssl_conf = default_conf

[default_conf]

ssl_conf = ssl_sect

[ssl_sect]

system_default = system_default_sect

[system_default_sect]

MinProtocol = TLSv1.1

CipherString = DEFAULT@SECLEVEL=1

2) curl "somehost" with the following parameters

$ curl --tlsv1 https://somehost

3) If the "somehost" just using a self-signed certificate

    $ curl -k --tlsv1 https://somehost

Reference:

https://my.oschina.net/u/4288355/blog/4268255