search

#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<string.h>
char *buff,*t1,*t2,*t3,*t4,ch;
FILE *fp;
int pid;
void search(char *t2,char *t3,char *t4)
{
int i=1,count=0;
char *p;
if((fp=fopen(t4,"r"))==NULL)
printf("File not found\n");
else
{
if(strcmp(t2,"f")==0)
{
while(fgets(buff,80,fp))
{
if((strstr(buff,t3))!=NULL)
{
printf("%d: %s\n",i,buff);
break;
}
}
i++;}
else if(strcmp(t2,"c")==0)
{
while(fgets(buff,80,fp))
{
if((strstr(buff,t3))!=NULL)
{
count++;
}
}
printf("No of occurences of %s= %d\n",t3,count);
}
else if(strcmp(t2,"a")==0)
{
while(fgets(buff,80,fp))
{
if((strstr(buff,t3))!=NULL)
{
printf("%d: %s\n",i,buff);
}
i++;
}
}
else
printf("Command not found\n");
fclose(fp);
}
}
main()
{
while(1)
{
printf("myshell$");
fflush(stdin);
t1=(char *)malloc(80);
t2=(char *)malloc(80);
t3=(char *)malloc(80);
t4=(char *)malloc(80);
buff=(char *)malloc(80);
fgets(buff,80,stdin);
sscanf(buff,"%s %s %s %s",t1,t2,t3,t4);
if(strcmp(t1,"pause")==0)exit(0);
else if(strcmp(t1,"search")==0)
search(t2,t3,t4);
else
{
pid=fork();
if(pid<0)
printf("Child process is not created\n");
else if(pid==0)
{
execlp("/bin",NULL);
if(strcmp(t1,"exit")==0)
exit(0);
system(buff);
}
else
{
wait(NULL);
exit(0);
}
}
}
}