How to use the `cat` command to display file size?

To display the file size using the cat command in Linux, you can use the stat command along with cat. Here’s an example:

cat example.txt | stat --printf="%s bytes\n"

This will display the size of the example.txt file in bytes. If you want to display the file size in a more human-readable format (such as kilobytes or megabytes), you can use the -c option along with the du command, like this:

cat example.txt | du -hc | tail -n 1

This will display the size of the file in a human-readable format, like “1.2K” or “3.4M”. Alternatively, you can just use the -h option with the ls command to display the file size in a human-readable format, like this:

ls -lh example.txt

This will display the file size in a format like “1.2K” or “3.4M”, along with other information about the file such as its permissions and modification time.

Note that for large files, it may take some time for the du command to calculate the file size, so be patient.