facing BTEQ issue

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facing BTEQ issue

we are facing weired issue while invoking BTEQ from UNIX....we have bunch od BTEQ's in shell script and they run one after another...it runs fine and suddenly for bunch of BTEQ's log files come up as empty. all it has is

BTEQ 08.02.04.00 Mon Dec 15 18:21:40 2008

so looks like unix invoked BTEQ but it never got logged in to database....can anyone through some light what we should be looking at....something on CLI side ???