ldd 命令用于判断某个可执行的binary档案含有什么动态链接库(so)

[root@NB ok]# ldd /bin/ls
    linux-vdso.so.1 =>  (0x00007ffd7dbf6000)
    libselinux.so.1 => /lib64/libselinux.so.1 (0x0000003429c00000)
    librt.so.1 => /lib64/librt.so.1 (0x0000003428c00000)
    libcap.so.2 => /lib64/libcap.so.2 (0x0000003434400000)
    libacl.so.1 => /lib64/libacl.so.1 (0x0000003432800000)
    libc.so.6 => /lib64/libc.so.6 (0x0000003428400000)
    libdl.so.2 => /lib64/libdl.so.2 (0x0000003428000000)
    /lib64/ld-linux-x86-64.so.2 (0x0000003427c00000)
    libpthread.so.0 => /lib64/libpthread.so.0 (0x0000003428800000)
    libattr.so.1 => /lib64/libattr.so.1 (0x0000003438000000)

[root@NB ok]# rpm -qf /usr/bin/ldd
glibc-common-2.12-1.166.el6.x86_64

ldd命令通常使用"-v"来显示所依赖的动态库的尽可能的详细信息：

[root@NB ok]# ldd -v /bin/ls
    linux-vdso.so.1 =>  (0x00007ffe97f6e000)
    libselinux.so.1 => /lib64/libselinux.so.1 (0x0000003429c00000)
    librt.so.1 => /lib64/librt.so.1 (0x0000003428c00000)
    libcap.so.2 => /lib64/libcap.so.2 (0x0000003434400000)
    libacl.so.1 => /lib64/libacl.so.1 (0x0000003432800000)
    libc.so.6 => /lib64/libc.so.6 (0x0000003428400000)
    libdl.so.2 => /lib64/libdl.so.2 (0x0000003428000000)
    /lib64/ld-linux-x86-64.so.2 (0x0000003427c00000)
    libpthread.so.0 => /lib64/libpthread.so.0 (0x0000003428800000)
    libattr.so.1 => /lib64/libattr.so.1 (0x0000003438000000)

    Version information:
    /bin/ls:
        librt.so.1 (GLIBC_2.2.5) => /lib64/librt.so.1
        libacl.so.1 (ACL_1.0) => /lib64/libacl.so.1
        libacl.so.1 (ACL_1.2) => /lib64/libacl.so.1
        libc.so.6 (GLIBC_2.4) => /lib64/libc.so.6
        libc.so.6 (GLIBC_2.3) => /lib64/libc.so.6
        libc.so.6 (GLIBC_2.3.4) => /lib64/libc.so.6
        libc.so.6 (GLIBC_2.2.5) => /lib64/libc.so.6
。。。。。。

# ldd haproxy 
    linux-vdso.so.1 =>  (0x00007fffea9ff000)
    libcrypt.so.1 => /lib64/libcrypt.so.1 (0x0000003a88400000)
    libc.so.6 => /lib64/libc.so.6 (0x0000003a85400000)
    libfreebl3.so => /lib64/libfreebl3.so (0x0000003a87400000)
    /lib64/ld-linux-x86-64.so.2 (0x0000003a85000000)
    libdl.so.2 => /lib64/libdl.so.2 (0x0000003a85c00000)