piaoger

#!/bin/bash

# from http://unix.stackexchange.com/questions/69167/bash-script-that-print-cpu-usage-diskusage-ram-usage

FREE_DATA=`free -m | grep Mem` 
CURRENT=`echo $FREE_DATA | cut -f3 -d' '`
TOTAL=`echo $FREE_DATA | cut -f2 -d' '`

echo CPU: `top -b -n1 | grep "Cpu(s)" | awk '{print $2 + $4}'`% 
echo RAM: $(echo "scale = 2; $CURRENT/$TOTAL*100" | bc)%

piaoger

# get public ipv4
# http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html
# http://stackoverflow.com/questions/14594151/methods-to-detect-public-ip-address-in-bash

AMI_ID=$(curl --connect-timeout 5 "http://169.254.169.254/latest/meta-data/ami-id")
if  [[ $AMI_ID == ami-* ]] ;
then
    IPV4=$(curl --connect-timeout 5 "http://169.254.169.254/latest/meta-data/public-ipv4")
else

piaoger

gitconfig() {
    git config user.name "piaoger"
    git config user.email "[email protected]"
}


rev=$(git rev-parse --short HEAD)
depot=https://github.com/piaoger/playground-rust.git

piaoger

# open file manager of current directory in the terminal
# http://askubuntu.com/questions/31069/how-to-open-a-file-manager-of-the-current-directory-in-the-terminal

xdg-open .

# mac
# open .

piaoger

// https://play.rust-lang.org/
// https://is.gd/VHQlvO


    // Line comments which go to the end of the line.
    /* Block comments which go to the closing delimiter. */


fn main () {

piaoger

// http://rustbyexample.com/scope/borrow.html
// https://is.gd/E0jeLL

fn simple_borrow() {

    let mut v = vec!["A"];

    {
        // immutable borrow

piaoger

// https://en.wikipedia.org/wiki/Dangling_pointer


void f() {
	int *x = malloc(sizeof(int));
	*x = 1024;
	printf("%d\n", *x);

piaoger

# raii (c++)

 before:
 void UseFile(char const* fn)
{
    FILE* f = fopen(fn, "r");        // 获取资源
    // 使用资源
    try {
        if (!g()) { fclose(f); return; }
        // ...

piaoger

# I want compress yesterday's log, so I have to learn how to get yesterday with bash
# yesterday=$(date --date='-1 day' +%Y-%m-%d)
# today=$(date +%Y-%m-%d)
# yesterday_log=service_log_${yesterday}.log
# zip ${yesterday_log}.zip ${yesterday_log}

## today
today=$(date +%Y-%m-%d)

piaoger

#!/bin/bash

appname=python

getpids() {
    local pids=$(ps -ef | grep $1 | grep -v grep| awk '{print $2}')
    echo $pids
}

pids=`getpids $appname`