使用 exec 在 C 的不同目录中执行 ls

Question

Title is pretty self-explanatory on what I want to do.

My current try:

  chdir("/Path/I/want/");   //this is different that the path my program is located at
      char * ls_args[] = { "ls" , "ls -l", NULL};
      execv(ls_args[0], ls_args);
    }

I am not getting any errors or output, any help?

Answer 1

Execv function needs full path of the command which you have to execute. So, instead of giving "ls" , you should find out where the ls is located in your system by

$ which ls

it will probably be in /bin folder. So you have to give "/bin/ls" to exec. Also any argument to ls should be another member in array. So instead of using

char * ls_args[] = { "ls", "ls -l", NULL};

use

char * ls_args[] = { "/bin/ls", "-l", NULL};