SIZE(1) User Commands SIZE(1)

NAME

size - print section sizes in bytes of object files

SYNOPSIS

size [-f] [-F] [-n] [-o] [-V] [-x] filename...

DESCRIPTION

The size command produces segment or section size information in bytes
for each loaded section in ELF object files. size prints out the size of
the text, data, and bss (uninitialized data) segments (or sections) and
their total.


size processes ELF object files entered on the command line. If an
archive file is input to the size command, the information for each
object file in the archive is displayed.


When calculating segment information, the size command prints out the
total file size of the non-writable segments, the total file size of the
writable segments, and the total memory size of the writable segments
minus the total file size of the writable segments.


If it cannot calculate segment information, size calculates section
information. When calculating section information, it prints out the
total size of sections that are allocatable, non-writable, and not
NOBITS, the total size of the sections that are allocatable, writable,
and not NOBITS, and the total size of the writable sections of type
NOBITS. NOBITS sections do not actually take up space in the filename.


If size cannot calculate either segment or section information, it prints
an error message and stops processing the file.

OPTIONS

The following options are supported:

-f
Prints out the size of each allocatable section, the name of the
section, and the total of the section sizes. If there is no section
data, size prints out an error message and stops processing the
file.


-F
Prints out the size of each loadable segment, the permission flags
of the segment, then the total of the loadable segment sizes. If
there is no segment data, size prints an error message and stops
processing the file.


-n
Prints out non-loadable segment or non-allocatable section sizes.
If segment data exists, size prints out the memory size of each
loadable segment or file size of each non-loadable segment, the
permission flags, and the total size of the segments. If there is
no segment data, size prints out, for each allocatable and non-
allocatable section, the memory size, the section name, and the
total size of the sections. If there is no segment or section data,
size prints an error message and stops processing.


-o
Prints numbers in octal, not decimal.


-V
Prints the version information for the size command on the standard
error output.


-x
Prints numbers in hexadecimal, not decimal.

EXAMPLES

The examples below are typical size output.

Example 1: Producing size information

example% size filename
2724 + 88 + 0 = 2812

Example 2: Producing allocatable section size information

example% size -f filename
26(.text) + 5(.init) + 5(.fini) = 36

Example 3: Producing loadable segment size information

example% size -F filename
2724(r-x) + 88(rwx) + 0(rwx) = 2812 ... (If statically linked)

SEE ALSO

as(1), ld(1), ar.h(3HEAD), a.out(5), attributes(7)

NOTES

Since the size of bss sections is not known until link-edit time, the
size command will not give the true total size of pre-linked objects.


August 24, 2009 SIZE(1)