LDD query commands or software-shared libraries (dynamic)

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ldd - print shared library dependencies

Synopsis
LDD [OPTION] ... FILE ...

DESCRIPTION
LDD Prints the shared libraries required by each program or shared library speci-
fied on the command line.

eg

Test LDD command sshd and httpd two programs support the functionality of TCP wrappers?

[[email protected] xinetd.d]# ldd $ (which sshd httpd)|grep Libwrap.so-b
/USR/SBIN/SSHD:
Linux-vdso.so.1 = (0x00007fff02dff000)
Libfipscheck.so.1 =/lib64/libfipscheck.so.1 (0x00007f6966e7e000)
libwrap.so.0 =/lib64/libwrap.so.0 (0x00007f6966c73000)//sshd support/etc/hosts. {Allow,deny} is similar to the low-end mechanism of a firewall, because TCP wrappers is used by this library most of the files that work.

LDD query commands or software-shared libraries (dynamic)