AmaranthLIS

pstree 32567
pstree -p 32567

pstree -p 32567| perl -ne 'print "$_\n" foreach /\((\d+)\)/g;'
pstree -p 32567| perl -ne '`kill -9 $_` foreach /\((\d+)\)/g;'

pstree -p 32567| perl -ne 'print "$1\n" while /\((\d+)\)/g;'
pstree -p 32567| perl -ne '`kill -9 $1` while /\((\d+)\)/g;'

AmaranthLIS

#find string in any file for dir/subdir
grep -lir 'go api' ./

#useful util for a lof of commands, example:
tldr grep
tldr find

#list of dir
grep mkyong -lr /path/folder

AmaranthLIS

#scheduler; list
$ atq
#add
echo wget https://sample.com | at 3:00 PM

$ cp /home/sample.txt{,-old}


$ ls
text_comes_here_1.txt

AmaranthLIS

sv s /service/*

Stops a service immediately (would still start on next boot):
# sv d ssh
Restarts a service:
# sv t ssh
# sv i postgresql
Reloads a service:
# sv h ssh
Shows status of a service and it's log service:

AmaranthLIS

        System.out.println("CompletableFuture");
        Future<String> foo = new CompletableFuture<>();
        System.out.println(foo.cancel(true));
        System.out.println(foo.cancel(true));

        System.out.println("Guava SettableFuture");
        foo = SettableFuture.create();
        System.out.println(foo.cancel(true));
        System.out.println(foo.cancel(true));

AmaranthLIS

public class Fibonacci {
    public static long fibonacci(int n) {
        if (n <= 1) return n;
        else return fibonacci(n-1) + fibonacci(n-2);
    }

    public static void main(String[] args) {
        int n = Integer.parseInt(args[0]);
        for (int i = 1; i <= n; i++)
            System.out.print(i + ": " + fibonacci(i));

AmaranthLIS

package main

import (
	"bytes"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
	"os"
	"strings"

AmaranthLIS

package main

import (
	"fmt"
	"log"
	"net/http"
	"github.com/gin-gonic/gin"
)

func main() {

AmaranthLIS

package main

import (
	"io/ioutil"
	"log"
	"net/http"
  "crypto/tls"
	"crypto/x509"
)

AmaranthLIS

package main

import (
	"context"
	"fmt"
	"log"
	"net/http"
)

func main() {