Command - equal to ldd

objdump -p <path/to/program> | grep -i needed

Command - while loop with date and sleep

while [ 1 ] ; do date +"%M:%S" ; sleep 1 ; done

merge one folder to another folder

if file exists in dummy_tmp, it will replace by file in origin_tmp

$ cp -RT origin_tmp/ dummy_tmp/
$ diff -ur dummy_tmp origin_tmp