（二）和菜鸟一起学习unix之文件和目录 getcwd，chdir

来源：互联网发布：淘宝关注链接怎么获取编辑：程序博客网时间：2024/06/06 17:18

GETCWD(3) Linux Programmer’s Manual GETCWD(3)

NAME
getcwd, get_current_dir_name, getwd - Get current working directory

SYNOPSIS
#include <unistd.h>

char *getcwd(char *buf, size_t size);

      如果buf不为空将绝对路径存入当中 size存储的最大空间
       char *get_current_dir_name(void);
       char *getwd(char *buf);

RETURN VALUE
NULL on failure with errno set accordingly, and buf on success. The
contents of the array pointed to by buf is undefined on error.
功能：getcwd函数获得当前工作目录的绝对路径

返回值：成功返回指向字符串的指针，错误返回0。

例子：

1 #include<stdio.h>
2 #include<unistd.h>
3 int main(int argc,char *argv[])
4 {
5 char a[255];
6 printf(getcwd(a,sizeof(a))) ;
}

CHDIR(2) Linux Programmer’s Manual CHDIR(2)

NAME
chdir, fchdir - change working directory

SYNOPSIS
#include <unistd.h>

int chdir(const char *path);

path参数你是更改到哪个目录路径名称

int fchdir(int fd);

DESCRIPTION
chdir() changes the current working directory to that specified in
path.

fchdir() is identical to chdir(); the only difference is that the
directory is given as an open file descriptor.

RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is
set appropriately.

功能：chdir更改当前工作目录

返回值：成功返回0 错误返回-1

例子
1 #include<stdio.h>
2 #include<unistd.h>
3 int main(int argc,char *argv[])
4 {
5     char a[255];
6     printf("\n");
7     printf(getcwd(a,sizeof(a))) ;
8     chdir("../");
9     printf("\n");
10     printf(getcwd(a,sizeof(a))) ;
11
12
13
14 }
~