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grep -Hn '<TAB>' *

cat -nT /tmp/foo | grep '\^I'

perl -lne 'print "$ARGV:$.:$_" if /\t/; close ARGV if eof' *

perl -ne 'print "$ARGV:$.:$_" if /\t/' /tmp/foo

for f in * ; do perl -ne 'print "$ARGV:$.:$_" if /\t/' $f; done