Import SSL certication into Java Keystore

Prerequisite: "*.crt", "*.key" from CA, assume the file names are "cert.crt" and "cert.key"
Steps to be performed in Windows desktop:

1. Rename "cert.crt" to "cert.cer" in Windows
2. Double click "cert.cer" and "Ceritificate" popup window should be displayed
3. Click "Certification Path" tab
4. Double click intermediate certification, eg. "GeoTrust RSA CA 2018", another "Certificate" popup window should be displayed
5. Click "Details" tab
6. Click "Copy to File..." button and save the content as "intermediate.cer"
7. Click "Certification Path" tab again"
8. Double click root certification, eg. "DigiCert", another "Certificate" popup window should be displayed
9. Click "Details" tab
10. Click "Copy to File..." button and save the content as "root.cer"
11. Concatenate "intermediate.cer" and "root.cer" into "allca.cer", eg. with command "cat intermediate.cer root.cer > allca.cer"
12. Execute command "openssl pkcs12 -export -in cert.crt -inkey cert.key -out cert.p12 -name {aliasname} -CAfile allca.cer -caname root -chain"
13. Append "$JAVA_HOME/bin" to "PATH" of cygwin, eg. "export PATH=$PATH:$JAVA_HOME/bin"
14. Execute command "keytool -importkeystore -deststorepass {password} -destkeystore cert.jks -srckeystore cert.p12 -srcstoretype PKCS12 -srcstorepass {password} -alias {aliasname}"

To verify, use command "keytool -list -v -keystore cert.jks -storepass {password}".

The Garbage Collection Handbook

To read regarding GIL in python

Terms to be checked after Python article reading

Regarding "Python is eating the world: How one developer's side project became the hottest programming language on the planet":
Global Interpreter Lock
https://realpython.com/python-gil/

4GL, New term heard today

https://docs.google.com/document/d/e/2PACX-1vQUGG28baEuS7RgpPpexNbxRxJfjzc6r43yhZoLF_56n7aacke-uVEdNVQxvkPf1NxsEuJfkMK0MCvi/pub

To avoid overlapping during typing, add following lines into .bashrc

PS1='\[\e[32m\]\u@\h:\W> \[\e[0m\]'
TERM=cygwin
export PS1
export TERM

Install sshpass for cygwin

$ curl -LO http://downloads.sourceforge.net/sshpass/sshpass-1.06.tar.gz
$ md5sum sshpass-1.06.tar.gz
$ tar xvf sshpass-1.06.tar.gz
$ cd sshpass-1.06
$ ./configure
$ make
$ make install

Big Fat Jar Compilation

 mvn clean install -P fat-jar package shade:shade@spark-fat-jar assembly:single

Check whether changes happen in multiple git repositories

for /f "tokens=*" %%a in ('dir /ad /b') do cd %%a & git status & cd ..

Thanks for the answers in https://stackoverflow.com/questions/24352701/check-status-of-all-git-repositories-at-once

Maven Tutorial

https://www.baeldung.com/maven

Explains, how to specify module dependencies and module hierarchies

Java Unit Test

Function name of test function needs to be started with "test"

Compilation when using std for gcc

Preprocessor -std=c++11
Linker -lstdc++

Integer Limit

Python does not have integer limit!
Good for coding contest.