==== valid_keywords ====
ps -o "$(ps -L)" >/dev/null

==== invalid_keywords ====
if ps -o "bogus" >/dev/null 2>&1; then  false;  fi

==== command ====
cc -O2 -pipe  -g  -MD -MP   -o shortsleep /home/src/regress/bin/ps/shortsleep.c 
sh /home/src/regress/bin/ps/command.sh

==== cwd ====
sh /home/src/regress/bin/ps/cwd.sh

==== user ====
sh /home/src/regress/bin/ps/user.sh