查看进程所使用的动态链接库文件

通过ldd 可以查看进程所使用的动态链接库文件：

 ldd /usr/local/openssh-5.2p1/sbin/sshd
        libwrap.so.0 => /usr/lib64/libwrap.so.0 (0x000000355dc00000)
        libpam.so.0 => /lib64/libpam.so.0 (0x0000003560800000)
        libdl.so.2 => /lib64/libdl.so.2 (0x000000355f000000)
        libcrypto.so.0.9.8 => /usr/local/openssl-0.9.8j/lib/libcrypto.so.0.9.8 (0x00002b111b848000)
        libutil.so.1 => /lib64/libutil.so.1 (0x0000003565000000)
        libz.so.1 => /usr/lib64/libz.so.1 (0x000000355f800000)
        libnsl.so.1 => /lib64/libnsl.so.1 (0x0000003560400000)
        libcrypt.so.1 => /lib64/libcrypt.so.1 (0x000000355e400000)
        libresolv.so.2 => /lib64/libresolv.so.2 (0x0000003561400000)
        libc.so.6 => /lib64/libc.so.6 (0x000000355e800000)
        libaudit.so.0 => /lib64/libaudit.so.0 (0x0000003562400000)
        /lib64/ld-linux-x86-64.so.2 (0x000000355d800000)

也可以查看进程是不是有使用动态链接库文件：

 ldd /usr/local/apache-2.2.11/bin/apachectl
        not a dynamic executable