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72 lines
1.7 KiB
Groff
72 lines
1.7 KiB
Groff
.\"
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.Dd March 21, 2023
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.Dt LDD 1
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.Os
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.Sh NAME
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.Nm ldd
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.Nd list dynamic object dependencies
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.Sh SYNOPSIS
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.Nm
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.Op Fl a
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.Op Fl f Ar format Op Fl f Ar format
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.Ar program ...
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.Sh DESCRIPTION
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The
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.Nm
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utility displays all shared objects that are needed to run the given program or
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to load the given shared object.
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Contrary to
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.Xr nm 1 ,
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the list includes
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.Dq indirect
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dependencies that are the result of needed shared objects which themselves
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depend on yet other shared objects.
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.Pp
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Zero, one or two
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.Fl f
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options may be given.
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The argument is a format string passed to
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.Xr rtld 1
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and allows customization of
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.Nm Ns 's
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output.
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If one is given, it sets
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.Ev LD_TRACE_LOADED_OBJECTS_FMT1 .
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If two are given, they set
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.Ev LD_TRACE_LOADED_OBJECTS_FMT1
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and
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.Ev LD_TRACE_LOADED_OBJECTS_FMT2 ,
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respectively.
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See
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.Xr rtld 1
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for details, including a list of recognized conversion characters.
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.Pp
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The
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.Fl a
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option displays the list of all objects that are needed by each loaded
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object.
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.Sh IMPLEMENTATION NOTES
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.Nm
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lists the dependencies of an executable by setting
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.Xr rtld 1
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environment variables and running the executable in a child process.
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If the executable is corrupt or invalid,
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.Nm
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may therefore fail without providing any diagnostic error messages.
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.Sh EXAMPLES
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The following is an example of a shell pipeline which uses the
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.Fl f
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option.
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It will print a report of all ELF binaries in the current directory,
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which link against the old libc.so.6:
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.Dl "find . -type f | xargs file -F ' ' | grep 'ELF.*dynamically' | cut -f1 -d' ' | xargs ldd -f '%A %o\en' | grep -F libc.so.6"
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.Sh SEE ALSO
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.Xr ld 1 ,
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.Xr nm 1 ,
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.Xr readelf 1 ,
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.Xr rtld 1
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.Sh HISTORY
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A
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.Nm
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utility first appeared in SunOS 4.0, it appeared in its current form in
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.Fx 1.1 .
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