Category 4

A dtksh category 4 command returns a value that can be used in a conditional expression just as in C. If the C function also returns values through reference variables (as in category 2), the dtksh command also uses variable names for the corresponding parameters. Example:

if XmIsTraversable $PUSH_BUTTON; then  
echo "The pushbutton is traversable"  
else 
echo "The pushbutton is not traversable"  fi

Generally, the order and type of parameters passed to a command matches those passed to the corresponding C function, except as noted for category 3 commands.