check size of file linux code example

Example 1: list file size as mb

ls -l --block-size=M

Example 2: linux file size

cd dir ; du -hsx * | sort -rh | head -20 
# example output
# 300MB    some_backup_file.log
# 1.8GB    some_huge_file.war

Example 3: linux command for file size

#Get file size of each folder
du -bsh *

Example 4: ls human readable size

du -sh directory_name    #Gives you the summarized(-s) size of the directory in human readable(-h) format
du -bsh *                #Gives you the apparent(-b) summarized(-s) size of all the files and directories in the current directory in human readable(-h) format

Example 5: find the size of file in linux

ls -l filename   #Displays Size of the specified file
ls -l *          #Displays Size of All the files in the current directory
ls -al *         #Displays Size of All the files including hidden files in the current directory
ls -al dir/      #Displays Size of All the files including hidden files in the 'dir' directory

Example 6: how to check the size of a file in linux c

If you have the file stream (FILE * f):

fseek(f, 0, SEEK_END); // seek to end of file
size = ftell(f); // get current file pointer
fseek(f, 0, SEEK_SET); // seek back to beginning of file
// proceed with allocating memory and reading the file

Or,

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
fd = fileno(f); 
struct stat buf;
fstat(fd, &buf);
int size = buf.st_size;

Or, use stat, if you know the filename:

#include <sys/stat.h>
struct stat st;
stat(filename, &st);
size = st.st_size;