PATH: all you need to know

Hi all,
Previously, I write a blog about LD_LIBRARY_PATH [1]. Continuing this series, I write this blog about another important environment variable in Linux which is PATH.
PATH is the environment that contains paths to executable files. For example, /home/tranlaman/bin, /usr/local/sbin, /usr/local/bin/, /usr/sbin, or /bin.
Otherwise, LD_LIBRARY_PATH contains dynamic library for other programs.