ldd

What is ldd?

ldd is a command-line tool that is used to print all the shared libraries required by an program or shared library

(This is used for already compiled code, so for example a binary executeable in /bin/*)

How to use ldd?

# syntax
ldd <executable>

# using the ldd tool
user@debian:~/tools/sudo$ ldd /bin/ls
        linux-vdso.so.1 =>  (0x00007fff4b1ff000)
        libselinux.so.1 => /lib/libselinux.so.1 (0x00007f26aac19000)
        librt.so.1 => /lib/librt.so.1 (0x00007f26aaa11000)
        libacl.so.1 => /lib/libacl.so.1 (0x00007f26aa809000)
        libc.so.6 => /lib/libc.so.6 (0x00007f26aa49d000)
        libdl.so.2 => /lib/libdl.so.2 (0x00007f26aa299000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f26aae3d000)
        libpthread.so.0 => /lib/libpthread.so.0 (0x00007f26aa07c000)
        libattr.so.1 => /lib/libattr.so.1 (0x00007f26a9e78000)