C library functions - system ()
C standard library - <stdlib.h>
description
C library functionsint system (const char * command) the command name or the name of the program specified commandcommand passed to the host environment to be executed by a processor, and returns after the command completes.
statement
Here is the () function declaration system.
int system(const char *command)
parameter
- command - the name of the variable that contains the requested C string.
return value
If an error occurs, the return value is -1, otherwise the return status of the command.
Examples
The following example demonstrates the system () function is used, a list of all files and directories under the current directory on unix machines.
#include <stdio.h>
#include <string.h>
int main ()
{
char command[50];
strcpy( command, "ls -l" );
system(command);
return(0);
}
Let's compile and run the above program, the following results will be in unix machine:
drwxr-xr-x 2 apache apache 4096 Aug 22 07:25 hsperfdata_apache drwxr-xr-x 2 railo railo 4096 Aug 21 18:48 hsperfdata_railo rw------ 1 apache apache 8 Aug 21 18:48 mod_mono_dashboard_XXGLOBAL_1 rw------ 1 apache apache 8 Aug 21 18:48 mod_mono_dashboard_asp_2 srwx---- 1 apache apache 0 Aug 22 05:28 mod_mono_server_asp rw------ 1 apache apache 0 Aug 22 05:28 mod_mono_server_asp_1280495620 srwx---- 1 apache apache 0 Aug 21 18:48 mod_mono_server_global
The following example demonstrates the system () function is used, a list of all files and directories under the current directory on a windows machine.
#include <stdio.h>
#include <string.h>
int main ()
{
char command[50];
strcpy( command, "dir" );
system(command);
return(0);
}
Let's compile and run the above program, the following results in windows machine will:
a.txt amit.doc sachin saurav file.c