由 Python 到 Shell

if a==b:
    print a
else:
    print b

for i in range(5):
    print i

def hello(number=0):
    number = 1
    print "hello %s" %number

#!/usr/bin/env bash

# example one: var

var_one="xiewei"   # 定义一个变量，是字符串

echo -e ${var_one}  # 打印这个变量

echo -e ${var_one}"wenlimin" # 字符串的拼接

echo -e ${#var_one} # 得出字符串的长度

echo -e ${var_one:0:5} # 提取字符串的前5个字符

# example two: args

echo $0  # 打印当前脚本的文件名

# 表示这个脚本需要传入两个参数才能正确执行

if [ $# -ne 2 ]; then
    echo -e "usage:  ./$0 arg_one arg_two"
    exit 1
fi

# 传入的两个参数

arg_one=$1
arg_two=$2

echo -e "The first argument is: ${arg_one}"
echo -e "The second argument is: ${arg_two}"


# example three: function

print_args(){
    arg_fun_one=$1
    arg_fun_two=$2
    echo -e "function first argument is: ${arg_fun_one}"
    echo -e "function second argument is: ${arg_fun_two}"
    return $((${arg_fun_one} + ${arg_fun_two}))
}
print_args 4 5
echo -e ${?}


# example four: list

# 读取当前文件下的所有文件 file_list
k=0
for i in `ls`
do
    file_list[k]=${i}
    k=$(( k + 1))
done

echo -e "The len of file list:"
echo -e ${#file_list[@]}
echo -e "show file list:"
echo -e ${file_list[@]}

# example five: create file

# 判断是否存在文件，不存在就创建

create_file="shell_05.sh"
file_flag=`ls | grep ${create_file}`

echo -e ${#file_flag}

if [ -z ${file_flag} ]
then
    touch ${create_file}
else
    echo -e "${create_file} exist"
fi

import sys
import subprocess
import os

print(sys.argv[0][-12:])


# 返回传入的参数

def get_sys_agrv():
    if len(sys.argv) <= 1:
        print("usage: python " + str(sys.argv[0][-12:]) + "argument")
        return 0
    else:
        file_name, *arg = sys.argv
        return file_name, arg


# 执行shell 脚本

def syscall(cmd):
    cmd = str(cmd)
    result = subprocess.Popen(
        cmd,
        shell=True,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE
    )
    out = str(result.communicate()[0])
    if result.returncode != 0:
        raise Exception("error")
    return out


# 传入文件名，判断是否存在，否则创建

def create_file(file_name):
    cmd = None
    if type(file_name) != str:
        return 0
    if os.path.isfile(file_name):
        print(str(file_name) + "exists")
    else:
        cmd = "touch " + str(file_name)
        syscall(cmd)
        return 1

# 读取当前文件夹下文件的列表

def file_list(pathdir):
    cmd = None
    list_file = None
    if not os.path.exists(pathdir):
        return 0
    else:
        cmd = "ls " + str(pathdir)
        rt = syscall(cmd)
        list_file = rt.strip('\n').split('\n')
        return list_file

print(file_list())