如何找到可执行程序所依赖的库？这就是 ldd 命令的作用了。对动态链接的二进制文件运行该命令会显示出所有依赖库和它们的路径。

		
$ ldd /bin/ls
        linux-gate.so.1 =>  (0xffffe000)
        librt.so.1 => /lib/tls/i686/cmov/librt.so.1 (0xb7f13000)
        libacl.so.1 => /lib/libacl.so.1 (0xb7f0d000)
        libselinux.so.1 => /lib/libselinux.so.1 (0xb7ef9000)
        libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb7dc4000)
        libpthread.so.0 => /lib/tls/i686/cmov/libpthread.so.0 (0xb7db1000)
        /lib/ld-linux.so.2 (0xb7f22000)
        libattr.so.1 => /lib/libattr.so.1 (0xb7dad000)
        libdl.so.2 => /lib/tls/i686/cmov/libdl.so.2 (0xb7da9000)
        libsepol.so.1 => /lib/libsepol.so.1 (0xb7d6c000)
		
		

举例

			# ./boinc
			./boinc: error while loading shared libraries: libssl.so.1.0.0: cannot open shared object file: No such file or directory

			# ldd ./boinc | grep libssl
			./boinc: /lib64/libcurl.so.4: no version information available (required by ./boinc)
			libssl.so.1.0.0 => not found
			libssl3.so => /lib64/libssl3.so (0x00007f1f46998000)
			libssl.so.10 => /lib64/libssl.so.10 (0x00007f1f44ba1000)