Descubriendo las librerias de un binario

Cómo ver las librerias de las que depende un binario:

[shell]
root@mailserver:/usr/share/doc/libsasl2# ldd `which postfix`
libpostfix-global.so.1 => /usr/lib/libpostfix-global.so.1 (0x4001c000)
libpostfix-util.so.1 => /usr/lib/libpostfix-util.so.1 (0x40040000)
libdb-4.2.so => /usr/lib/libdb-4.2.so (0x40065000)
libnsl.so.1 => /lib/tls/libnsl.so.1 (0x4013b000)
libresolv.so.2 => /lib/tls/libresolv.so.2 (0x4014f000)
libgdbm_compat.so.3 => /usr/lib/libgdbm_compat.so.3 (0x40161000)
libc.so.6 => /lib/tls/libc.so.6 (0x40164000)
libdl.so.2 => /lib/tls/libdl.so.2 (0x40299000)
libgdbm.so.3 => /usr/lib/libgdbm.so.3 (0x4029d000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
[/shell]