Also, if you know in advance your file names, why not begin your process
with something like the following:
fls=. 'BaseTCs.xml';'PhonyBaloney';'erf.2.xml';'NonExist.ant'
fexist&> fls
1 0 1 0
checkFls=: 3 : 0
if. 0~:missingfls=. (]#~[:-.fexist&>) y do.
('Missing: ','.',~}:;(<', '),~&.>missingfls) 13!:8]99 NB. Signal
error.
else. 1 end.
)
foo=: 3 : 'checkFls y'
foo fls
|Missing: PhonyBaloney, NonExist.ant,.: checkFls
| ('Missing: ','.',~}:;(<', '),~&.>missingfls) 13!:8]99
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