c python shell文件读写

linux

#include <stdio.h>//#include <sys/types.h>//#include <sys/stat.h>#include <fcntl.h>      //headfile of open#include <errno.h>      //headfile of errno#include <string.h>     //headfile of sterror#include <unistd.h>     //headfile of readvoid readFile(){        char filepath[] = "/home/zijing/readfile.txt";        int     fd = open(filepath, O_RDONLY);        if(fd == -1){                printf("read error, %s -->  %s\n",filepath, strerror(errno));                return;        }//      printf("success fd = %d\n", fd);        char buf[100];        memset(buf,0,sizeof(buf));        while(read(fd, buf, sizeof(buf) - 1) > 0){                printf("%s\n", buf);                memset(buf, 0, sizeof(buf));        }        printf("%s\n",buf);        close(fd);}void writeFile(){        char filepath[] = "/home/zijing/writefile.txt";        int     fd = open(filepath, O_RDWR | O_APPEND);        if (fd == -1){                printf("write error, %s -- > %s\n", filepath, strerror(errno));                return;        }//      printf("success fd = %d\n", fd);        char buf[100];        memset(buf, 0, sizeof(buf));        strcpy(buf, "hello linux from c\n");        write(fd,buf,strlen(buf));        close(fd);}int main(int arg, char *args[]) {        readFile();        writeFile();        return 0;}

python

def readfileOnce():        file = open('/home/zijing/readfile.txt', encoding='utf-8')        data = file.read()        file.close()        print(data,end='')                      #end line without '\n'def readfileBylist():        file = open('/home/zijing/readfile.txt','r',encoding='utf-8')        for line in file.readlines():                print(line,end = '')    #end line without '\n'        file.close()def readfileBylines():        # high efficent        file = open('/home/zijing/readfile.txt','r',encoding='utf-8')        for line in file:                print(line,end = '')    #end line without '\n'        file.close()def writefile():        file = open('/home/zijing/writefile.txt','a',encoding='utf-8')        file.write("hello linux from python\n")        file.close()readfileOnce()readfileBylist()readfileBylines()writefile()

shell

#!/bin/bash#sign:          2017/9/17       zijing#funtion:       file opreate of read and fileFILEPATH="/home/zijing/readfile.txt"FILEWRITEPATH="/home/zijing/writefile.txt"function readfile(){        cat $FILEPATH | while read line; do        echo $line;        done}function writefile(){        echo "hello linux from shell" >> $FILEWRITEPATH}readfilewritefile