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+ ans  =
+ 
+    1.  
+ 
+-->exec('Example8.sci')
+ 
+-->clear
+ 
+-->flag=1
+ flag  =
+ 
+    1.  
+ 
+-->mode(-1)
+Current date is 23-Jun-2013 
+ 
+Welcome to the Textbook Companionship Project 2013 
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ 
+ Book Title                             :       UNIX CONCEPTS AND APPLICATIONS    
+ 
+ Book Edition                         :                                                                           4   
+ 
+ Book Author                          :                                                    Sumitabha Das   
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ 
+ Code Author                          :                                                     Pranav Bhat T   
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ 
+ Chapter Number                    :                                                                            24   
+ 
+ Chapter Title                         :                              Systems programming II- Files   
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+Example 8    :    Show the effect of using the exec command to run a unix command 
+ 
+ ****************************************************************   
+ 
+ Answer    :      
+ 
+ INSTRUCTIONS   :    
+  
+ 1.These programs are part of systems programming PURELY in Unix and the commands have NO EQUIVALENT IN SCILAB   
+  
+ 2.However the .c files which are displayed here are also made into a seperate file.If you are a unix user then try compiling and 
+       running the programme with gcc or cc compiler                                                                              
+  
+ 3.The outputs displayed here are just MOCK OUTPUTS which are DISPLAYED IN THE TEXTBOOK   
+  
+ 4.The inconvenience is regretted.   
+.............Press [ENTER] to continue.....	UNIX SHELL SIMULATOR(DEMO VERSION WITH PRELOADED COMMANDS)
+
+
+
+
+$ cat exec_and_fork.c      # to open the file emp.lst /* Program: exec_and_fork.c -- Uses fork, exec and wait to run a unix command */
+#include <stdio.h>
+#include <wait.h>
+
+int main(int argc,char **argv) {
+    int returnval;           /* Used by wait*/
+    
+    switch(fork()) {
+          case 0:           /* Run command in child */
+          if ((exec(argv[1], &argv[2]) < 0 )) {
+              fprintf(stderr, "execl error\n");
+              exit(200);
+              }
+          default:              /* In the parent */
+             wait(&returnval);  /* After the command has completed .. */
+             fprintf(stderr,"Exit status: %d\n",WEXITSTATUS(returnval));
+             exit(0);
+             }
+}
+ $ cc exec_and_fork.c $ a.out   /bin/grep   grep   -i -n  SUMIT   /etc/passwd                    15:sumit:x:102:10::/users1/home/staff/sumit:/usr/bin/bash
+Exit status: 0 
+
+
+$ exit        #To exit the current simulation terminal and return to Scilab console
+
+........# (hit [ENTER] for result)
+
+			BACK TO SCILAB CONSOLE...
+Loading initial environment 
+-->diary(0)