Purpose
With no arguments, print the current focus setting for the
LRIS blue dewar. With one argument, reset the blue dewar focus
to the specified value.
Usage
focusb [value]
Arguments
value = new dewar focus value [microns]
Output
The new/current focus setting is printed on stdout
Restrictions
- "value" must be a real number
Exit values
0 = normal completion
1 = wrong number of arguments
Example
1) show the current blue focus
focusb
2) change the blue focus to 2112
focusb 2112