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C program to execute shell script

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# 1  
Old 10-27-2009
C program to execute shell script
Hi,

Can anyone give me a sample code to execute shell script from C program.

Thanks
# 2  
Old 10-27-2009
man system
Example:
system("pwd");
# 3  
Old 10-27-2009
C program to execute Shell script with arguments
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.

Code:
#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;
}

Last edited by pludi; 10-28-2009 at 03:24 AM.. Reason: code tags, please...
# 4  
Old 10-28-2009
C program to execute script
In C++, you can:

Code:
#include <stdlib.h>
#include <stdio.h>
#include <string>

int main (int argc, char *argv[])
{
 int count;
 std::string cadena = "";
 std::string orden;

 for (count = 1; count < argc; count++)
 {
   cadena.append (argv[count]);
 }
 orden = "/tmp/lab5.sh " + cadena;
 return system(orden.c_str());
}

If you need C language, only you must replace the "append" operation with concatenate (strcat or sprintf) variables C char *.
Last edited by fpmurphy; 10-28-2009 at 09:20 AM.. Reason: code tags added
# 5  
Old 10-28-2009
In "C program to execute Shell script with arguments "thread, you can see an C++ example.
# 6  
Old 10-28-2009
This line of code is invalid
Code:
return system("/tmp/lab5.sh ", argv[count]);

The system() API takes one argument only. Man system for more information.

Hint - create a buffer using an array or malloc(). strcpy "/tmp/lab5.sh " to buffer. strcat argv[count] to the buffer. Use buffer as argument to system API.
# 7  
Old 11-04-2009
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.

Code:
#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;
}

One more thing - you call return system() in for(). return will terminate main() immediately so you won't have your script executed argc times. I'd suggest to save the return value of system in new variable and examine it if you need error checking.
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