The Solaris PATH Problem: /usr/bin vs /usr/xpg4/bin vs /usr/sfw/bin vs /usr/gnu/bin
Why Solaris has several versions of grep, awk, sed and tar in /usr/bin, /usr/xpg4/bin, /usr/sfw/bin and /usr/gnu/bin, and how to set PATH for users, root, cron and SMF on Solaris 10 and 11.4.