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Simple as:
cnt= `lscnt=`ls \*.txt 2>/dev/null | wc -l` if [ "$cnt" != "0" ]; then ./script fi
wc -l counts the lines in the expanded wildcard.
wc -l
cnt= `ls \*.txt 2>/dev/null | wc -l` if [ "$cnt" != "0" ]; then ./script fi
cnt=`ls \*.txt 2>/dev/null | wc -l` if [ "$cnt" != "0" ]; then ./script fi
cnt= `ls \*.txt | wc -l` if [ "$cnt" != "0" ]; then ./script fi
cnt= `ls \*.txt | wc -l` if [ cnt"$cnt" != "0" ]; then ./script fi
cnt= `ls \*.txt | wc -l` if [ cnt ]; then ./script fi
wc counts the lines in the expanded wildcard.
wc
