ouyi

top # list processes, shift+p to sort processes by CPU usage
top -H -p <pid> # list threads, shift+p to sort threads by CPU usages
printf "%x\n" <tid> # convert tid to hexadecimal, called nid
jstack -l <pid> | grep -i <nid> -A 15 # get stack trace of the thread

ouyi

image_id="$1"
for i in $(docker images -q); do 
    docker history $i | grep -q "$image_id" && echo $i; 
done | sort -u

ouyi

go to file begin/end:
fn + cmd + <-/->

file structure popup:
fn + cmd + F12

search everywhere:
shift shift

search for classes:

ouyi

import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import java.util.List;

public class PrintJvmOptions {
    public static void main(String[] args) {
        RuntimeMXBean runtimeMxBean = ManagementFactory.getRuntimeMXBean();
        List<String> options = runtimeMxBean.getInputArguments();
        for(String o : options) {
            System.out.println(o);

ouyi

$ sudo keytool -storepass changeit -import -file /tmp/root.crt -noprompt -alias my-trusted-ca -keystore /Library/Java//JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/security/cacerts
Password:
Certificate was added to keystore

// changeit is the Java default keystore password

$ keytool -storepass changeit -list -keystore /Library/Java//JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/security/cacerts | grep my-trusted-ca
my-trusted-ca, Apr 11, 2018, trustedCertEntry,

ouyi

#/usr/bin/env bash

set -euo pipefail

src_host="$1"
src_path="$2"
dst_host="$3"
dst_path="$4"
pattern="${5:-*}"

ouyi

# Install docker
yum check-update
curl -fsSL https://get.docker.com/ | sh
systemctl start docker
systemctl status docker
systemctl enable docker
systemctl status docker

# Set up the server-side of things

ouyi

#/usr/bin/env python

import sys, argparse, pytz
from datetime import datetime, timedelta

DEFAULT_DATETIME_FORMAT = '%Y%m%d'
SECONDS_IN_A_DAY = 3600 * 24

def main():
    parser = argparse.ArgumentParser(description='A command-line tool to work with dates')

ouyi

#!/usr/bin/env/python
# 
# More of a reference of using jinaj2 without actual template files.
# This is great for a simple output transformation to standard out.
#
# Of course you will need to "sudo pip install jinja2" first!
#
# I like to refer to the following to remember how to use jinja2 :)
# http://jinja.pocoo.org/docs/templates/
#

ouyi

## Indirect expansion

# aax="x"
# aay="y"

# var_name="aax"
# echo ${!var_name}
x
# var_name="aay"