$ ldd /bin/cp            
linux-vdso.so.1 => (0x00007ffff59df000)
libselinux.so.1 => /lib64/libselinux.so.1 (0x00007fb3357e0000)
librt.so.1 => /lib64/librt.so.1 (0x00007fb3355d7000)
libacl.so.1 => /lib64/libacl.so.1 (0x00007fb3353cf000)
libattr.so.1 => /lib64/libattr.so.1 (0x00007fb3351ca000)
libc.so.6 => /lib64/libc.so.6 (0x00007fb334e35000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007fb334c31000)
/lib64/ld-linux-x86-64.so.2 (0x00007fb335a0d000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fb334a14000)

 $ ll /lib64/libacl.so*           
lrwxrwxrwx. 1 root root 15 1月 7 2015 /lib64/libacl.so.1 -> libacl.so.1.1.0
-rwxr-xr-x. 1 root root 31280 12月 8 2011 /lib64/libacl.so.1.1.0

$ ll /lib64/libc.so*            
lrwxrwxrwx 1 root root 12 8月 12 14:18 /lib64/libc.so.6 -> libc-2.12.so

// filename:hello.c
#include <stdio.h>

void hello(const char* name)
{
 printf("hello %s!n", name);
}

// filename:hello.h
void hello(const char* name);

gcc hello.c -fPIC -shared -Wl,-soname,libhello.so.0 -o libhello.so.0.0.1

 $ ll libhello.so.0            
lrwxrwxrwx 1 handy handy 17 8月 17 14:18 libhello.so.0 -> libhello.so.0.0.1

 $ readelf -d /lib64/libacl.so.1.1.0                     

Dynamic section at offset 0x6de8 contains 24 entries:
Tag Type    Name/Value
0x0000000000000001 (NEEDED)  Shared library: [libattr.so.1]
0x0000000000000001 (NEEDED)  Shared library: [libc.so.6]
0x000000000000000e (SONAME)  Library soname: [libacl.so.1]

 $ readelf -d /lib64/libc-2.12.so                     

Dynamic section at offset 0x18db40 contains 27 entries:
Tag Type    Name/Value
0x0000000000000001 (NEEDED)  Shared library: [ld-linux-x86-64.so.2]
0x000000000000000e (SONAME)  Library soname: [libc.so.6]

// filename:main.c
#include "hello.h"

int main()
{
 hello("handy");
 return 0;
}

├── hello.c
├── hello.h
├── libhello.so.0 -> libhello.so.0.0.1
├── libhello.so.0.0.1
└── main.c

 $ gcc main.c -L. -lhello -o main                      
/usr/bin/ld: cannot find -lhello

├── hello.c
├── hello.h
├── libhello.so -> libhello.so.0.0.1
├── libhello.so.0 -> libhello.so.0.0.1
├── libhello.so.0.0.1
└── main.c

gcc main.c -L. -lhello -o main

 $ ldd main                        
 linux-vdso.so.1 => (0x00007fffe23f2000)
 libhello.so.0 => not found
 libc.so.6 => /lib64/libc.so.6 (0x00007fb6cd084000)
 /lib64/ld-linux-x86-64.so.2 (0x00007fb6cd427000)

 $ export LD_LIBRARY_PATH=. && ldd main                    
 linux-vdso.so.1 => (0x00007fff7bb63000)
 libhello.so.0 => ./libhello.so.0 (0x00007f2a3fd39000)
 libc.so.6 => /lib64/libc.so.6 (0x00007f2a3f997000)
 /lib64/ld-linux-x86-64.so.2 (0x00007f2a3ff3b000)

├── hello.c
├── hello.h
├── libhello.so -> libhello.so.0.0.1
├── libhello.so.0 -> libhello.so.0.0.1
├── libhello.so.0.0.1
├── main
└── main.c

 $ ./main                        
hello Handy!

├── libhello.so.0.0.1
└── main

 $ ./main                        
./main: error while loading shared libraries: libhello.so.0: cannot open shared object file: No such file or directory

├── libhello.so.0 -> libhello.so.0.0.1
├── libhello.so.0.0.1
└── main

// filename:hello.c
#include <stdio.h>

void hello(const char* name)
{
 printf("hello %s, welcom to our world!n", name);
}

gcc hello.c -fPIC -shared -Wl,-soname,libhello.so.0 -o libhello.so.0.0.2

├── libhello.so.0 -> libhello.so.0.0.1
├── libhello.so.0.0.1
├── libhello.so.0.0.2
└── main

├── libhello.so.0 -> libhello.so.0.0.2
├── libhello.so.0.0.1
├── libhello.so.0.0.2
└── main

 $ ./main                        
hello Handy, welcom to our world!

gcc hello.c -fPIC -shared -Wl,-soname,libhello.so.1 -o libhello.so.1.0.0

├── libhello.so.0 -> libhello.so.0.0.2
├── libhello.so.0.0.1
├── libhello.so.0.0.2
├── libhello.so.1 -> libhello.so.1.0.0
├── libhello.so.1.0.0
└── main