NAME
ldd —
list dynamic object
dependencies
SYNOPSIS
ldd |
[-a] [-v]
[-f format]
program ... |
DESCRIPTION
Theldd utility displays all shared objects that are
needed to run the given program or to load the given shared object. Contrary
to nm(1), the list includes “indirect” dependencies that are
the result of needed shared objects which themselves depend on yet other
shared objects.
Zero, one or two -f options may be given.
The argument is a format string passed to
rtld(1) and allows customization of ldd's
output. If one is given, it sets
LD_TRACE_LOADED_OBJECTS_FMT1. If two are given, they
set LD_TRACE_LOADED_OBJECTS_FMT1 and
LD_TRACE_LOADED_OBJECTS_FMT2, respectively. See
rtld(1) for details, including a list of recognized conversion
characters.
The -a option displays the list of all
objects that are needed by each loaded object. This option does not work
with a.out(5) binaries.
The -v option displays a verbose listing
of the dynamic linking headers encoded in the executable. See the source
code and include files for the definitive meaning of all the fields.
EXAMPLES
The following is an example of a shell pipeline which uses the
-f option. It will print a report of all ELF
binaries in the current directory, which link against libc.so.6:
find . -type f | xargs -n1 file -F '
' | grep 'ELF.*dynamically' | cut -f1 -d' ' | xargs ldd -f '%A %o\n' | grep
libc.so.6SEE ALSO
HISTORY
A ldd utility first appeared in SunOS 4.0,
it appeared in its current form in FreeBSD 1.1.
The -v support is based on code written by
John Polstra
<jdp@polstra.com>