See(C) Code

how can you tell whether a program is statically linked? And if it is dynamically linked, how do you know what libraries it needs? The ldd command can answer both questions shiv@ubuntu:~$ ldd /sbin/ldconfig         not a dynamic executable  (ldconfig is not dynmic loadable) shiv@ubuntu:~$ ldd /bin/ln   (ln is dynamic loadable but it needs below listed things to run)         linux-gate.so.1 =>  (0x00918000)         libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0x00110000)         /lib/ld-linux.so.2 (0x0033f000)  ldconfig ------------ you use the ldconfig command without parameters to rebuild ld.so.cache ldconfig  -p | less to display ld.so.cache how does the dynamic loader know where to look for executables? >>As with many things on Linux, there is a configuration file in /etc. shiv@ubuntu:~$ cat /etc/ld.so.conf include /etc/ld.so.conf.d/*.conf shiv@ubuntu:~$ ls /etc/ld.so.conf.d/*.conf | more /etc/ld.so.conf.d/GL.conf /etc/ld.so.conf.d