create specified size file by random content

create_specified_size_file_by_random_content.py

# coding: utf-8
__author__ = 'Jux.Liu'

import os
from subprocess import Popen
from time import sleep

cmd_new_file_multiline = 'base64 /dev/urandom 2>>/dev/null | head -c {filesize} > ./{size}{unit}_{file_no} && echo "" >> ./{size}{unit}_{file_no}'
cmd_new_file_one_line = 'tr -dc A-Za-z0-9 </dev/urandom 2>>/dev/null | head -c {filesize} > ./{size}{unit} && echo "" >> ./{size}{unit}'
cmd_one_file_multiline = 'base64 /dev/urandom 2>>/dev/null | head -c {filesize} >> ./{size}{unit}_{file_no} && echo "" >> ./{size}{unit}_{file_no}'
cmd_one_file_one_line = 'tr -dc A-Za-z0-9 </dev/urandom 2>>/dev/null | head -c {filesize} >> ./{size}{unit} && echo "" >> ./{size}{unit}'

cmd_new_line= ''

OneKB = 1024

units = {
    "KB": 1,
    "MB": 1024
}

loop_size = {
    "KB": [1, 5, 10, 50, 100, 500],
    # "MB": [1, 5]
}

cmd = cmd_one_file_one_line

loop_times = 100
for unit in units:
    for size in loop_size.get(unit, []):
        for i in range(loop_times):
            # !!! large file will take times to create
            # !!! and be careful of your memory
            c = cmd.format(filesize=size * units[unit] * OneKB - 1, size=size, unit=unit, file_no=i)
            os.system(c)