shell | script self run check

LINUX:

MYARGS="$(ps -wwo args= $$)"; ps wwaux | grep -v grep | grep "$MYARGS" | grep -vwe "$$" -vwe "$PPID" && exit

LINUX && OPENBSD:

MYARGS="$(ps -wwo args= -p $$)";
MYSESS="$(ps -wwo sess= -p $$)";
ps -wwo sess,args= | grep -v grep | grep "$MYARGS" | grep -vw $MYSESS > /dev/null 2>&1 && exit