$ apt-file search libdl.so.2
libc6: lib/libdl.so.2
libc6-amd64: lib64/libdl.so.2
libc6-dbg: usr/lib/debug/libdl.so.2
libc6-i686: lib/i686/cmov/libdl.so.2
libc6-xen: lib/i686/nosegneg/libdl.so.2
systemimager-boot-i386-standard: usr/share/systemimager/boot/i386/standard/initrd_template/lib/libdl.so.2
systemimager-boot-ia64-standard: usr/share/systemimager/boot/ia64/standard/initrd_template/lib/libdl.so.2



$ apt-file search libdl
dietlibc: usr/lib/diet/lib/libdl.so
dietlibc-doc: usr/share/doc/dietlibc-doc/libdl.README
libc6: lib/libdl-2.6.1.so
libc6: lib/libdl.so.2
libc6-amd64: lib64/libdl-2.6.1.so
libc6-amd64: lib64/libdl.so.2
libc6-dbg: usr/lib/debug/lib/i686/cmov/libdl-2.6.1.so
libc6-dbg: usr/lib/debug/lib/i686/nosegneg/libdl-2.6.1.so
libc6-dbg: usr/lib/debug/lib/libdl-2.6.1.so
libc6-dbg: usr/lib/debug/lib64/libdl-2.6.1.so
libc6-dbg: usr/lib/debug/libdl-2.6.1.so
libc6-dbg: usr/lib/debug/libdl.so.2
libc6-dev: usr/lib/libdl.a
libc6-dev: usr/lib/libdl.so
libc6-dev: usr/lib/xen/libdl.a
libc6-dev-amd64: usr/lib64/libdl.a
libc6-dev-amd64: usr/lib64/libdl.so
libc6-i686: lib/i686/cmov/libdl-2.6.1.so
libc6-i686: lib/i686/cmov/libdl.so.2
libc6-prof: usr/lib/libdl_p.a
libc6-xen: lib/i686/nosegneg/libdl-2.6.1.so
libc6-xen: lib/i686/nosegneg/libdl.so.2
libdl-ruby: usr/share/doc/libdl-ruby/changelog.Debian.gz
libdl-ruby: usr/share/doc/libdl-ruby/copyright
libdlisp0: usr/lib/libdlisp.so.0
libdlisp0: usr/lib/libdlisp.so.0.0.0
libdlisp0: usr/share/doc/libdlisp0/README.Debian
libdlisp0: usr/share/doc/libdlisp0/changelog.Debian.gz
libdlisp0: usr/share/doc/libdlisp0/copyright
libdlisp0-dev: usr/lib/libdlisp.a
libdlisp0-dev: usr/lib/libdlisp.la
libdlisp0-dev: usr/lib/libdlisp.so
libdlisp0-dev: usr/share/doc/libdlisp0-dev/annotated.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/changelog.Debian.gz
libdlisp0-dev: usr/share/doc/libdlisp0-dev/classes.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/config_8h.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/copyright
libdlisp0-dev: usr/share/doc/libdlisp0-dev/dlisp_8dox.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/dlispfreememory_8c.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/dlispparser_8h.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/doxygen.css
libdlisp0-dev: usr/share/doc/libdlisp0-dev/doxygen.png
libdlisp0-dev: usr/share/doc/libdlisp0-dev/files.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/functions.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/functions_eval.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/functions_vars.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/globals.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/globals_defs.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/globals_func.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/index.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/parserreader_8c.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/redump__lisp_8c.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/structdlisp__lispentry.html
libdlisp0-dev: usr/share/doc/libdlisp0-dev/tab_b.gif
libdlisp0-dev: usr/share/doc/libdlisp0-dev/tab_l.gif
libdlisp0-dev: usr/share/doc/libdlisp0-dev/tab_r.gif
libdlisp0-dev: usr/share/doc/libdlisp0-dev/tabs.css
libdlisp0-dev: usr/share/doc/libdlisp0-dev/test-free_8c.html
libdlm-dev: usr/include/libdlm.h
libdlm-dev: usr/lib/libdlm.a
libdlm-dev: usr/lib/libdlm.so
libdlm-dev: usr/lib/libdlm_lt.a
libdlm-dev: usr/lib/libdlm_lt.so
libdlm-dev: usr/share/doc/libdlm-dev/changelog.Debian.gz
libdlm-dev: usr/share/doc/libdlm-dev/copyright
libdlm1: lib/libdlm.so.1
libdlm1: lib/libdlm.so.1.03.00
libdlm1: lib/libdlm_lt.so.1
libdlm1: lib/libdlm_lt.so.1.03.00
libdlm1: usr/share/doc/libdlm1/changelog.Debian.gz
libdlm1: usr/share/doc/libdlm1/copyright
libuclibc-dev: usr/i386-uclibc-linux/lib/libdl.a
libuclibc-dev: usr/i386-uclibc-linux/lib/libdl.so
libuclibc-dev: usr/i386-uclibc-linux/lib/libdl_pic.a
libuclibc0: usr/i386-uclibc-linux/lib/libdl-0.9.27.so
libuclibc0: usr/i386-uclibc-linux/lib/libdl.so.0
lsb-build-base2: usr/lib/lsb2/libdl.so
lsb-build-base3: usr/lib/lsb3/libdl.so
mingw32-runtime: usr/i586-mingw32msvc/lib/libdlcapi.a
mlton: usr/lib/mlton/sml/mlnlffi-lib/memory/linkage-libdl.sml
qt-x11-free-dbg: usr/lib/debug/usr/lib/qt3/plugins/designer/libdlgplugin.so
qt3-designer: usr/lib/qt3/plugins/designer/libdlgplugin.so
systemimager-boot-i386-standard: usr/share/systemimager/boot/i386/standard/initrd_template/lib/libdl.so.2
systemimager-boot-ia64-standard: usr/share/systemimager/boot/ia64/standard/initrd_template/lib/libdl.so.2