C program to execute Shell script with arguments

baigmd · 10-27-2009, 08:43 PM

Hi,

Can anyone help with the below code. I am trying to execute Shell script with arguments in C program but it is giving errors.

#include <stdlib.h>
#include <stdio.h>

int main (int argc, char *argv[])
{
int count;
for (count = 1; count < argc; count++)
{
return system("/tmp/lab5.sh ", argv[count]);
}
return 0;
}

TB0ne · 10-27-2009, 09:33 PM

Quote:

Originally Posted by baigmd

Hi,

Can anyone help with the below code. I am trying to execute Shell script with arguments in C program but it is giving errors.

#include <stdlib.h>
#include <stdio.h>

int main (int argc, char *argv[])
{
int count;
for (count = 1; count < argc; count++)
{
return system("/tmp/lab5.sh ", argv[count]);
}
return 0;
}

Then how about telling us what the actual errors ARE, and maybe we can help.

neonsignal · 10-27-2009, 09:34 PM

The system call only takes a single string argument. You will need to append the lab5 argument to the "/tmp/lab5.sh" string inside the C code before calling system.

baigmd · 10-27-2009, 09:40 PM

#include <stdlib.h>
#include <stdio.h>

int main (int argc, char *argv[])
{
int count;
for (count = 1; count < argc; count++)
{
return system("/tmp/lab5.sh argv[count]");
}
return 0;
}

The result i m getting is
[root@RH100 /]# ./lab5 ad /etc/passwd
This is lab5.sh, running at Tue Oct 27 22:36:21 EDT 2009
It is running on RH100.com
Script being run by
User root
UID 0
who is really root

Called with 1 arguments
-> Argument argv[count] either is not a regular file, or doesn't exist

===========
It should show called with 2 arguments and first one should display not a regular file and second one should display as a file. The problem is parameters are not being passed to shell script properly.

neonsignal · 10-27-2009, 09:51 PM

You might need to do a bit of background reading on using strings in C. The language has little native support for strings, so you need to write code and use string library functions to manipulate them (in your example, you might make use of strncat).

You might find this task easier in a scripting language such as bash shell script or perl, which handle strings natively, unless you have particular reasons for wanting to use C.