Bash script to find files with mixed whitespace (tabs and spaces)

find-mixed-whitespace.sh

#!/bin/bash

for F in $(find . -type f -print); do
  TCOUNT=$(grep -ce '^\t' $F)
  SCOUNT=$(grep -ce '^ ' $F)
  if [[ $TCOUNT -gt 0 ]] && [[ $SCOUNT -gt 0 ]]; then
    echo $F
  fi
done

That doesn't work – at least not with gnu grep, maybe on Mac Os or bsd it works. The (gnu) grep default regexp syntax does not know \t, you have to add an additional -P in line 4 to make it work.