wget and curl 指令

wget 指令介紹
curl 指令介紹
使用curl 批次下載

Linux 圖片轉檔指令

convert beach.gif beach.pnm


NAME
convert - convert an image or sequence of images

SYNOPSIS
convert [ options ... ] input_file output_file

DESCRIPTION
Convert converts an input file using one image format to an output file with a differing image format. In addition, various types of image processing can be performed on the converted image during the conversion process. Convert recognizes the image formats listed in ImageMagick.

Install Flask on CentOS 7.0

1. Install pip on CentOS 7.0

## First install the EPEL repo as per your Operating system version and architecture.
rpm -ivh http://mirror01.idc.hinet.net/EPEL/7/x86_64/e/epel-release-7-1.noarch.rpm
yum install -y python-pip

2. Install Flask

pip install Flask

## Test
vi hello.py

from flask import Flaskapp = Flask(__name__)
@app.route("/")def hello():    return "Hello World!"
if __name__ == "__main__":    app.run()

## Verify
python hello.py

* Running on http://0.0.0.0:80/

Python: ConfigParser

[core]
cmd = /usr/bin/vim

[mod]
safe_edit = yes
time_interval = 20

python 程式如下：

#!/usr/bin/python
from ConfigParser import SafeConfigParser
parser = SafeConfigParser()
parser.read('test.conf')

#傳回字串 /usr/bin/vim
parser.get('core', 'cmd')

#傳回 boolean 值 True
parser.getboolean('mod', 'safe_edit')

#傳回整數值 20
parser.getint('mod', 'time_interval')

references:
http://williewu.blogspot.tw/2007/10/python-configparser.html
https://wiki.python.org/moin/ConfigParserExamples
https://docs.python.org/2.6/library/configparser.html

How to find script's directory

import os
print os.path.dirname(os.path.realpath(__file__))

reference:
http://stackoverflow.com/questions/4934806/python-how-to-find-scripts-directory

strip in C programming

strtok(Name, "\n");

references:
http://stackoverflow.com/questions/2693776/removing-trailing-newline-character-from-fgets-input

HPL 相關

How to calculate peak theoretical performance of a CPU-based HPC system

FLOPS per cycle for sandy-bridge and haswell SSE2/AVX/AVX2

System Performance and Ranking Estimation

http://hpl-calculator.sourceforge.net/HPL-HowTo.pdf

Linux TOP 指令說明

Linux TOP 指令說明

VIRT  程序使用的虛擬記憶體總量，單位 kb。VIRT=SWAP+RES

RES    程序使用的、未交換出的實體記憶體大小，單位 kb。RES=CODE+DATA

SHR    共享記憶體大小，單位 kb

reference

http://blog.ycnets.com/2013/09/01/linux-commandtop/

GnuPlot references

地圖/統計圖/3d 函數圖/實驗報告圖 -- Gnuplot 純畫圖 (作者: 洪朝貴老師)
http://user.frdm.info/ckhung/b/ma/gnuplot.php

Gnuplot 入門教學
http://randle.wordpress.com/2007/06/12/gnuplot-induction/