static/dynamic library, "file" comman usage

Refer from https://www.cs.utk.edu/help/doku.php?id=compile:c

Compile Phase:

# gcc -c hello.c

Dynamic Linking:

# gcc -o hello hello.o
# ls -lh hello
-rwx------  1 user group 12K Sep 18 18:35 hello
# file hello
hello: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV),
for GNU/Linux 2.2.0, dynamically linked (uses shared libs), not stripped

Static Linking:

# gcc -static -o hello hello.o
# ls -lh hello
# -rwx------  1 user group 465K Sep 18 18:38 hello
# file hello
hello: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV),
for GNU/Linux 2.2.0, statically linked, not stripped