You can use any one of the following command line options to display file size on Linux or Unix-like operating systems:
a] ls command – list directory contents.
b] du command – estimate file space usage.
c] stat command – display file or file system status.
To determine the size of a file called /bin/grep, enter:
ls -l /bin/grep
-rwxr-xr-x 1 root root 175488 May 13 2012 /bin/grep
In the above output example, the 175488 is the size of the file. For a more user friendly output, pass the -h option to the ls command:
ls -lh /bin/grep
-rwxr-xr-x 1 root root 172K May 13 2012 /bin/grep
In the above output example, the 172K is the size of the file. The du command provides the same output in a more user friendly way and it hides all other details too:
du -h /bin/grep
Finally, stat command also provide file size:
stat /bin/grep File: `/bin/grep' Size: 175488 Blocks: 344 IO Block: 4096 regular file Device: 900h/2304d Inode: 5505033 Links: 1 Access: (0755/-rwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2013-06-10 01:31:37.520022359 +0530 Modify: 2012-05-13 18:17:28.000000000 +0530 Change: 2013-05-17 02:16:17.138033825 +0530
The following commands are executed on Apple OS X Unix operating systems to file out the file size of the /usr/bin/vim binary file:
$ ls -l /usr/bin/vim
$ ls -lh /usr/bin/vim
$ stat -x /usr/bin/vim