I have seen many commands that accept a "BSD syntax" as well as their standard syntax. Take the ps
command for one example:
To see every process on the system using standard syntax:
ps -e
ps -ef
ps -eF
ps -ely
To see every process on the system using BSD syntax:
ps ax
ps axu
So what is the difference between these two routes? In general when they say in BSD syntax what elements I should remember? Is this syntax just for those commands which they are in the BSD also?