#获取当前脚本所在绝对路径 
cur_dir=$(cd "$(dirname "$0")"; pwd) 

 2、C语言版

    方法一：用realpath函数。这种方法用于开机启动程序获取自身目录会出错。

char current_absolute_path[MAX_SIZE];  
//获取当前目录绝对路径  
if (NULL == realpath("./", current_absolute_path))  
{  
    printf("***Error***\n");  
    exit(-1); 
}  
strcat(current_absolute_path, "/");  
printf("current absolute path:%s\n", current_absolute_path);  

char current_absolute_path[MAX_SIZE];   
//获取当前目录绝对路径  
if (NULL == getcwd(current_absolute_path, MAX_SIZE))  
{ 
    printf("***Error***\n");  
    exit(-1); 
} 
printf("current absolute path:%s\n", current_absolute_path);   

char current_absolute_path[MAX_SIZE];  
//获取当前程序绝对路径  
int cnt = readlink("/proc/self/exe", current_absolute_path, MAX_SIZE);  
if (cnt < 0 || cnt >= MAX_SIZE)  
{  
    printf("***Error***\n");     
    exit(-1);  
}  
//获取当前目录绝对路径，即去掉程序名 
int i;  
for (i = cnt; i >=0; --i)  
{  
    if (current_absolute_path[i] == '/')  
    {  
        current_absolute_path[i+1] = '\0';  
        break;  
    }  
}  
printf("current absolute path:%s\n", current_absolute_path);