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Your example doesn't seem to match your requirement. I'll match the example:
if test appears in the line, look for duplicates (2 only, not 3)


awk ' /test/ {arr[$0]++}
END{ for(i in...

#! /bin/tcsh

set filea=/blah1/blah2/blah3
set fileb=/blah1/blah2/blah3/blah4
set filec=/blah1/blah2/blah3/blah4/blah5
foreach file ($filea $fileb $filec)
set numtabs=`echo $file | awk...

what does the variable $test contains?
If there are "/" in variable, you should escape it or use another terminator.
sed "s|$test||g"