array pointer initialized, but could not assign any values into it? program in c

= doesn't copy a string in C, it only copies the pointer. From your description, it sounds like you're probably leaking a bunch of memory from the

command.argv[0] = "man";

lines you mention. The most noticeable problem is with this assignment in your second code block:

argTemp[ii] = command.argv[ii];

That assignment leaks the allocation you just made on the previous line (which, incidentally, probably should have a +1 in it). On the line after, you are trying to do a strcpy(), but after this assignment, you're just doing a strcpy() from one string to the same string, and not actually copying any values.

I ran the following program:

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

#define LINE_LEN        80
#define MAX_ARGS        64
#define MAX_ARG_LEN     64
#define MAX_PATHS       64
#define MAX_PATH_LEN    96

#ifndef NULL
#define NULL            0
#endif

struct command_t {
    char *name;
    int argc;
    char *argv[MAX_ARGS];
};

int main() {
    size_t ii;  // Assumed

    /* Command initialisation, allocate type command */
    struct command_t command;
    command.name = (char *) malloc(LINE_LEN);
    command.argc = 0;
    for(ii=0; ii < MAX_ARGS; ii++) {  /* i < 64 */
        command.argv[ii] = (char *) malloc(MAX_ARG_LEN);
    }

    command.name = "man";
    command.argc = 2;
    command.argv[0] = "man";
    command.argv[1] = "socket";

    size_t argc = command.argc; // Assumed

    char *argTemp[argc+1];
    for(ii = 0; ii < argc+1; ii++){
        if(strlen(command.argv[ii])){
            argTemp[ii] = (char *)malloc(strlen(command.argv[ii]));
            strcpy(argTemp[ii], command.argv[ii]);
        } else {
            argTemp[ii] = (char*)NULL;
        }
    }

    printf("argTemp[0] == %p (%s)\n", argTemp[0], argTemp[0]);

    return 0;
}

I get the following output:

argTemp[0] == 0x159bd470 (man)

Based on what you wrote, this is what I expect, but this isn't what you're getting. Your problem seems to be elsewhere. Can you post a full code example replicating the problem?

I did notice a few bugs and issues in your code:

1. You're iterating to argTemp[3], which is probably not what you want. Remove the +1 from the last for loop.
2. You aren't initializing command.argv[ii] with an empty string. Simply writing command.argv[ii][0] = '\0'; will fix that.
3. You're calling strlen twice. You should instead cache the result of strlen.
4. You're allocating memory for your command strings, yet you end up just reassigning the command strings. This may be for the sake of example, but if you are reassigning, you have a memory leak (as you're not freeing the malloced memory).
5. You are only allocating enough memory for the string's contents, and not the null terminator at the end of the string. strcpy will thus write '\0' at argTemp[ii][strlen(command.argv[ii])], which is undefined behaviour.