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(1)//c program to copy content of one file to

anotherwithout using buffer.

#include

#include

#include

int main()

{

char c;

int in,out;

in=open("a.txt",O_RDONLY);

out=open("b.txt",O_WRONLY|O_CREAT,S_IRUSR|

S_IWUSR);

while(read(in,&c,1)==1)

write(out,&c,1);

}

(2)//c program to print fibonicci series till first 15 term

using recursion.

#include

#include

#include

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void main()

{

int n=15,i,a=0,rec;printf("fibo series is \n");

printf("%d\n",a);

for ( i=0; i< n-1; i++ )

{

rec=fib(i);

printf("%d\n",rec);

}

}

int fib(int x)

{

if(x

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{

FILE *p;

char sen[20];printf("enter the sentence");

fgets(sen,20,stdin);

p=fopen("myfile.txt","a");

fputs(sen,p);

fclose(p);

}

(4)//c program to read name and age from a file and then

display on the monitor.

#include

int main()

{

FILE *p;

int age;char name[20];

p=fopen("st.txt","r+");

printf("enter name and age");

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fscanf(p,"%s",name);

fscanf(p,"%d",&age);

fclose(p);p=fopen("st1.txt","w");

fprintf(stdout,"%s",name);

fprintf(stdout,"%d",age);

fclose(p);

}

(5)//c program to copy specific content from specified

position from one file to another

#include

int main()

{

FILE *p,*q;

char buffer[15];

p=fopen("anu.txt","r");fseek(p,15,SEEK_SET);

fgets(buffer,15,"anu.txt");

q=fopen("pam.txt","w");

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fputs(buffer,q);

fclose(p);

fclose(q);}

(6)//c program to use lseek

#include

#include

#include

void main()

{

int fd,x;

fd=open("app.txt",O_RDWR);

x=lseek(fd,30,SEEK_CUR);

printf("%d\n",x);

close(fd);

}

(7)//c program to check user name.

#include

#include

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#include

void main()

{char name[10];

name=system("whoami");

if(name=="sangeeta")

{

printf("hello");

printf("gud morning");

}

else

printf("bye");

}

(8)//c program to print a to z in a file

#include

void main()

{

FILE *p;

char c;

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p=fopen("dic.txt","r+");

if(p!=NULL)

{for(c='a';c

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{

printf("directory is created");

}else

printf("not created");

}

(10)// c program to read from one file and write in other

using buffer.

#include

#include

#include

int main()

{

size_t fd,fd1,n;

char buffer[40];

fd=open("a.txt",O_RDWR);

fd1=open("b.txt",O_RDWR);

n=read(fd,buffer,40);write(fd1,buffer,40);

close(fd);

close(fd1);

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}

(11)//to list all files names in a directory with i-node

number

#include

#include

int main()

{

DIR *p;

struct dirent *dp;

if((p=opendir("dolly"))==NULL)

printf("error");

while(dp=readdir(p))

{

printf("%s\n",dp->d_name);

printf("%ld\n",dp->d_ino);

}

closedir(p);

}(12)//to find out which has more no of files among two

two directories

#include

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#include

int main()

{DIR *p,*q;

int c=0,c1=0;

struct dirent *dp;

p=opendir("first");

while((dp=readdir(p))!=NULL)

c=c+1;

q=opendir("second");

while((dp=readdir(q))!=NULL)

c1=c1+1;

if(c>c1)

printf("first is larger ");

else

printf("second is larger");

}

(13)//to find out which has more content among two files

#include

int main()

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{

FILE *p,*q;

int x,y;p=fopen("first.txt","r+");

fseek(p,0,SEEK_END);

x=ftell(p);

q=fopen("second.txt","r+");

fseek(q,0,SEEK_END);

y=ftell(q);

if(x>y)

printf("first.txt is larger");

else

printf("second.txt is larger");

}

(14)//to make a directory and print error no when it is

already present#include

#include

#include

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#include

void main()

{int x,y;

x=mkdir("dir1",S_IRWXU);

if(x==0)

printf("directory created");

else

y=errno;

printf("error is""%d",y);

}

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