Get inode number of a given file

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Here is an example in c

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>

/*
* * get_inode --returns the inode of the file associated with the given file descriptor, or -1 on failure
* */
int get_inode (int fd)
{
    struct stat buf;
    int ret;

    ret = fstat(fd, &buf);
    if ( ret <0 ) {
         perror ("fstat");
         return -1;
    }

    return buf.st_ino;
}

int main (int argc, char *argv[])
{
    int fd, inode;
    if ( argc < 2) {
       fprintf ( stderr, "usage: %s <file>\n", argv[0]) ;
       return 1;
    }

    fd = open ( argv[1],O_RDONLY);
    if ( fd < 0 ) {
      perror ("open");
      return 1;
    }

    inode = get_inode (fd);
    printf("%d\n",inode);
    return 0;
}

run it

$cc get_inode.c -o get_inode
$./get_inode /etc/bashrc
131094

Same result you can get by command ls

$ls -i /etc/bashrc
131094 /etc/bashrc

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