Differences

This shows you the differences between two versions of the page.

@@ Line 1: / Line 1: @@
+{{keywords>wiki library source code example reference}}
+====== system ======
+<code c>
+    #include <stdlib.h>
+     int system(const char *string);
+</code>
+system calls a command on the shell
+===== system c code example =====
+<code c>
+/*
+ * system example code
+ * http://code-reference.com/c/stdlib.h/system
+ */
+#include <stdio.h>
+#include <stdlib.h>
+int main (void)
+{
+  char * command = "uname -a";
+  int cmd = system( command );
+  if( cmd == -1 ) { printf( "Error while initalize system command.\n"); }
+  else if( cmd > 0 )   { printf( "command return value  %d.\n", cmd ); }
+  else  printf( "success\n" );
+  return 0;
+}
+</code>
+==== Output ====
+    user@host:~$ ./system
+    Linux host 3.0.0-15-generic-pae #26-Ubuntu SMP Fri Jan 20 17:07:31 UTC 2012 i686 i686 i386 GNU/Linux
+    success

on the occasion of the current invasion of Russia in Ukraine