find has several operators that take a decimal integer. One such argument is -size. The number after this argument is the size of the files in disk blocks. Unfortunately, this is a vague number. Earlier versions of UNIX used disk blocks of 512 bytes. Newer versions allow larger block sizes, so a "block" of 512 bytes is misleading.
This confusion is aggravated when the command
is used. The
option supposedly lists the size of the file in blocks.
But if your system has a different block size than ls -s has been
programmed to assume, it can give a misleading answer.
You can put a
after the number, and specify the size in bytes.
To find a file with exactly 1234 bytes (as in an ls -l listing), type:
find . -size 1234c -print
To search for files using a range of file sizes, a minus or plus sign can be
specified before the number.
The minus sign (
and the plus sign (
This next example lists all files that are greater than 10,000 bytes,
but less than 32,000 bytes:
find . -size +10000c -size -32000c -print
When more than one qualifier is given,.