02-13-2009
find uses a block size of 512.
From manual:
-size n[c] True if the file is n blocks long (512 bytes
per block). If n is followed by a c, the
size is in bytes.
apparantly, ls -s uses a block size of 1024.
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GETBSIZE(3) BSD Library Functions Manual GETBSIZE(3)
NAME
getbsize -- get user block size
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdlib.h>
char *
getbsize(int *headerlenp, long *blocksizep);
DESCRIPTION
The getbsize() function determines the user's preferred block size based on the value of the ``BLOCKSIZE'' environment variable; see
environ(7) for details on its use and format.
The getbsize() function returns a pointer to a null-terminated string describing the block size, something like ``1K-blocks''. The memory
referenced by headerlenp is filled in with the length of the string (not including the terminating null). The memory referenced by
blocksizep is filled in with block size, in bytes.
If the user's block size is unreasonable, a warning message is written to standard error and the returned information reflects a block size
of 512 bytes.
SEE ALSO
df(1), du(1), ls(1), systat(1), environ(7)
HISTORY
The getbsize() function first appeared in 4.4BSD.
BSD
June 4, 1993 BSD