#include <stdio.h>
      #include <stdlib.h>
      #include <string.h>
      
      int grep(int argc, char *argv[]) {
      	FILE *fd;
      	char str[100];
      	char c;
      	int i, j, k, m, flag;
      	char temp[30];
      	if (argc != 3) {
      		printf("Number of Arguements provided != 3 \n");
      		printf("Arguements Required: \n");
      		printf("Search Text \n");
      		printf("Filename \n");
      		exit(-1);
      	}
      	fd = fopen(argv[2], "r");
      	if (!fd) {
      		printf("%s does not exist. \n", argv[2]);
      		exit(-1);
      	}
      	while (!feof(fd)) {
      		i = 0;
      		while (1) {
      			c = fgetc(fd);
      			if (feof(fd)) {
      				str[i++] = '\0';
      				break;
      			}
      			if (c == '\n') {
      				str[i++] = '\0';
      				break;
      			}
      			str[i++] = c;
      		}
      		if (strlen(str) >= strlen(argv[1])) {
      			for (k = 0; k <= strlen(str) - strlen(argv[1]); k++) {
      				for (m = 0; m < strlen(argv[1]); m++) {
      					temp[m] = str[k + m];
      				}
      				temp[m] = '\0';
      				if (strcmp(temp, argv[1]) == 0)	{
      					printf("%s\n", str);
      					break;
      				}
      			}
      		}
      	}
      	printf("\n");
      	return 0;
      }
      
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      grep simulation

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      Simulate the ls command

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