hanx11

# maximum capability of system
user@ubuntu:~$ cat /proc/sys/fs/file-max
708444

# available limit
user@ubuntu:~$ ulimit -n
1024

# To increase the available limit to say 200000
user@ubuntu:~$ sudo vim /etc/sysctl.conf

luckydev

# maximum capability of system
user@ubuntu:~$ cat /proc/sys/fs/file-max
708444

# available limit
user@ubuntu:~$ ulimit -n
1024

# To increase the available limit to say 200000
user@ubuntu:~$ sudo vim /etc/sysctl.conf

neilrenicker

Convert an m4a file to an mp3 using ffmpeg

• Install ffmpeg using homebrew:

brew install ffmpeg

• convert the file:

binaryatrocity

from sys import argv
from base64 import b64encode
from datetime import datetime
from Crypto.Hash import SHA, HMAC

def create_signature(secret_key, string):
    """ Create the signed message from api_key and string_to_sign """
    string_to_sign = string.encode('utf-8')
    hmac = HMAC.new(secret_key, string_to_sign, SHA)
    return b64encode(hmac.hexdigest())

lenciel

基础知识

• 计算机软硬件基础
• 计算机网络
• 操作系统
• 数据结构和算法
• 设计模式
• 以及其他各种你应该懂的东西

前端开发

• 前端标准/规范