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keep track of the last 10 commands the user typed

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# 8  
Old 09-18-2006
zhshqzyc

"history' is an alias for "fc"!!!
ALTRUNVRSOFLN
# 9  
Old 09-18-2006
ALTRUNVRSOFLN, what the OP is trying to say is that (s)he is trying to write a shell and wants to keep track of the command history in a manner that is similar to what our usual shells do.

A simple solution would be to have a 2-D array where you store commands. When you execute each command, you store it in the array. When the user types 'history', you can run a for loop that will go over the 2-D array and print the last 10 commands.
# 10  
Old 09-19-2006
So, can we enforce
Code:
argv[0] = "history";
argv[1]  = "10";

by assigning them. then call system
Code:
execvp[argv[0],argv);

# 11  
Old 09-19-2006
No, you cannot do that. history is a shell builtin command. You can only execute actual command-files that way. You will have to write code that implements what history does if you want it to work.
# 12  
Old 09-19-2006
Okay. thanks.

I am encountering a pointer assignment problem.

Suppose
Code:
extern char **hist;//record history commands


Code:
 static char cmd[MAXLINE];//command line characters
  char *cmdp;

What I did is to record all the commands.
Code:
 cmdp=cmd;
   while ((*hist[j] = *cmdp)!='\0')
   {
        hist[j]++;cmdp++;
   }

However,after I execute the program,
Segmentation fault
# 13  
Old 09-19-2006
You are hitting a NULL pointer somewhere. Put printf statements at different points in your program, as in before entering the while loop, for each iteration, print the value that you are comparing, after the while loop, etc. This will tell you exactly where the problem is occurring and what is the state of your data at that point.

You can then find the cause and fix it.
# 14  
Old 09-19-2006
Code:
A simple solution would be to have a 2-D array where you store commands. When you execute each command, you store it in the array. When the user types 'history', you can run a for loop that will go over the 2-D array and print the last 10 commands.

Dear blowtorch:
If I create this 2D array in a function,how can I return the array into the main function? I am going to print them in the main function.
Use extern variables or pointer?
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