Linux | File Programs

                 

                    File Program 1

#include<stdio.h>
#include<unistd.h>
#include<fcntl.h>
#include<error.h>

int main()
{
int fd;

fd = open("test",O_RDONLY|O_CREAT,0477);

if(fd<0)
{
perror("Open");
return 0;
}


char c;
int s;

s=read(fd,&c,1);

if(s)
{
printf("\nRead Character: %c",c);
}

printf("\n\n");

close(fd);

}

 File Program 2

#include<stdio.h>

#include<unistd.h>

#include<fcntl.h>

#include<error.h>

int main()

{

int fd;

fd = open("test",O_WRONLY|O_CREAT,0666);

if(fd<0)

{

perror("Open");

return 0;

}

char c[] = "Welcome To Files...";

int s;

s=write(fd,c,sizeof(c));

if(s)

{

printf("\nWritten Character: %d",s);

}

printf("\n\n");

close(fd);

}

 File Program 3

#include<stdio.h>

#include<unistd.h>

#include<fcntl.h>

#include<error.h>

int main()

{

int fd;

fd = open("test",O_RDONLY|O_CREAT,0666);

if(fd<0)

{

perror("Open");

return 0;

}

char c;

int s;

while(1)

{

s=read(fd,&c,1);

if(!s)

break;

printf("%c",c);

}

printf("\n\n");

close(fd);

}

 File Program 4

#include<stdio.h>

#include<error.h>

#include<stdlib.h>

#include<fcntl.h>

#include<unistd.h>

#include<string.h>

int main()

{

int fd;

fd = open("test",O_RDWR,0644);

//fd = creat("test",0644);

if(fd<0)

{

perror("File Open");

exit(1);

}

int s,len;

char txt[100];

printf("\nEnter Text to be written to File: ");

gets(txt);

len = strlen(txt);

s = write(fd,txt,len);

printf("%d characters written to file...\n\n",s);

s = lseek(fd,0,SEEK_SET);

printf("\n[%d]\n",s);

strcpy(txt,"\0") ;

s = read(fd,txt,100);

printf("%s-%d",txt,s);

close(fd);

return 0;

}

 File Program 5

#include<stdio.h>

#include<error.h>

#include<stdlib.h>

#include<fcntl.h>

#include<unistd.h>

struct stu

{

char name[40];

int rno;

double cg;

};

int main()

{

int fd;

struct stu s2,s1={"VS",333,9.9};

fd = open("test",O_RDWR|O_CREAT,0644);

if(fd<0)

{

perror("File Open");

exit(1);

}

int s;

s = write(fd,"This is Test File",10);

printf("%d characters written to file...\n\n",s);

s = write(fd,&s1,sizeof(s1));

printf("%d characters written to file...\n\n",s);

lseek(fd,-1*sizeof(s1),SEEK_CUR);

s = read(fd,&s2,sizeof(s2));

printf("Read Record: %s - %d - %lf\n\n",s2.name,s2.rno,s2.cg);

close(fd);

return 0;

}

 File Program 6

#include<stdio.h>

#include<error.h>

#include<stdlib.h>

#include<fcntl.h>

#include<unistd.h>

#include<string.h>

int main()

{

int fd;

fd = open("test",O_CREAT|O_WRONLY,0644);

if(fd<0)

{

perror("File Open");

exit(1);

}

int s,len;

char txt[100];

printf("\nEnter Text to be written to File: ");

gets(txt);

len = strlen(txt);

s = write(fd,txt,len);

printf("%d characters written to file...\n\n",s);

close(fd);

return 0;

}

 File Program 7

#include<stdio.h>

#include<sys/stat.h>

#include<error.h>

#include<stdlib.h>

#include<fcntl.h>

#include<unistd.h>

#include<string.h>

#include<time.h>

int main()

{

int fd;

struct stat st;

fd = lstat("File1.c",&st);

//fd = creat("test",0644);

if(fd<0)

{

perror("File Open");

exit(1);

}

printf("\nSize: %d",st.st_size);

printf("\nInode: %d",st.st_ino);

printf("\nDevice Number: %d,%d",major(st.st_dev),minor(st.st_dev));

printf("\nUser ID: %o",st.st_uid);

printf("\nGroup ID: %o",st.st_gid);

printf("\nMode: %o",st.st_mode);

struct tm *t;

char tt[50];

t = localtime(&st.st_atime);

strftime(tt,50,"%c",t);

printf("\nModification Time: %s",tt);

char *mt = ctime(&st.st_mtime);

printf("\nAccess Time: %s",mt);

char *ct = ctime(&st.st_ctime);

printf("\nChange Time: %s",ct);

printf("\n\n");

return 0;

}