[Info-vax] Notable VMS "feature"

[VAXman- at SendSpamHere.ORG]

In article <1be0c2f0-5f9d-4c11-b233-eb19d8dc2100 at googlegroups.com>, Tom Adams <tadamsmar at gmail.com> writes:
>On Thursday, January 7, 2016 at 4:56:54 PM UTC-5, David Froble wrote:
>> VAXman- @SendSpamHere.ORG wrote:
>> > In article <4779702f-8074-4cdd-b809-1cf36c20a162 at googlegroups.com>, Tom Adams <tadamsmar at gmail.com> writes:
>> >> On Thursday, January 7, 2016 at 2:28:33 PM UTC-5, VAXman- wrote:
>> >>> In article <aec0b901-1099-48bb-899c-70d9952e1010 at googlegroups.com>, Tom Adams <tadamsmar at gmail.com> writes:
>> >>>> I have defined a logical name that I cannot deassign
>> >>>>
>> >>>> A logical name that is 255 characters long that ends with a colon.
>> >>>>
>> >>>> Here's a command procedure than will do it.
>> >>>>
>> >>>> $A = "X"
>> >>>> $A = A+A
>> >>>> $A = A+A
>> >>>> $A = A+A
>> >>>> $A = A+A
>> >>>> $A = A+A
>> >>>> $A = A+A
>> >>>> $A = A+A
>> >>>> $A = A+A
>> >>>> $A = F$EXTRACT(0,254,A)
>> >>>> $A = A+":"
>> >>>> $WRITE SYS$OUTPUT "''F$LENGTH(A)'"
>> >>>> $DEFINE 'A FOOBAR
>> >>>> $!Cannot deassign using the name because the colon is stripped
>> >>>> $ON ERROR THEN CONTINUE
>> >>>> $DEASS 'A
>> >>>> $!Cannot deassign by adding a extra colon because the name it too long
>> >>>> $B = A+':'
>> >>>> $DEASS 'B
>> >>>>
>> >>>> Is there anyway to get rid of this logical name other than logging out?
>> >>>>
>> >>> 	PROGRAM MY_TERMINAL
>> >>> 	IMPLICIT NONE
>> >>>
>> >>> 	INCLUDE '($DSCDEF)'
>> >>> 	INCLUDE '($JPIDEF)'
>> >>> 	INCLUDE '($STSDEF)'
>> >>> 	INCLUDE '(LIB$ROUTINES)'
>> >>> 	INCLUDE '(STR$ROUTINES)'
>> >>>
>> >>> 	INTEGER*4 STATUS
>> >>>
>> >>> 	RECORD	/DSCDEF1/ LOGICAL
>> >>>
>> >>> 	LOGICAL.DSC$W_MAXSTRLEN = 0
>> >>> 	LOGICAL.DSC$B_DTYPE = DSC$K_DTYPE_T
>> >>> 	LOGICAL.DSC$B_CLASS = DSC$K_CLASS_D
>> >>> 	LOGICAL.DSC$A_POINTER = 0
>> >>>
>> >>> 	STATUS = STR$DUPL_CHAR(LOGICAL,254,%REF('X'))
>> >>> 	IF (.NOT.(STATUS.AND.STS$M_SUCCESS)) THEN
>> >>> 	  CALL SYS$EXIT(%VAL(STATUS))
>> >>> 	ENDIF
>> >>>
>> >>> 	STATUS = STR$APPEND(LOGICAL,%DESCR(':'))
>> >>> 	IF (.NOT.(STATUS.AND.STS$M_SUCCESS)) THEN
>> >>> 	  CALL SYS$EXIT(%VAL(STATUS))
>> >>> 	ENDIF
>> >>>
>> >>> 	STATUS = LIB$DELETE_LOGICAL(LOGICAL,)
>> >>> 	CALL SYS$EXIT(%VAL(STATUS))
>> >>>
>> >>> 	END
>> > 
>> > Oops.  I just noticed I forgot to change the program name.  Oh, the horrors
>> > of cut and paste!
>> > 
>> 
>> See, even Brian isn't infallible ....
>> 
>> :-)
>> 
>> 
>> Then there is the obvious, just shoot the fool that set up a logical name 
>> anywhere near that long ....
>
>Try this!:
>
>define :: ::

$ DEASSIGN :::

-- 
VAXman- A Bored Certified VMS Kernel Mode Hacker    VAXman(at)TMESIS(dot)ORG

I speak to machines with the voice of humanity.