The Internet knows pretty much everything, we just need to ask the right questions
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tesseract important.png stdout | egrep -v '^$' # Search important.png for text, push to stdout, then remove blank lines
tesseract important.png stdout -psm 11 -l eng # Set the PSM (Page Segmentation Mode) to 11, find as much text as possible in no particular order
for i in *.jpg; do tesseract $i stdout -psm 11 -l eng >> words.txt; done # Dirty bash loop to gather text from all jpgs in dir
egrep -v '^$' # Remove blank lines
fmt -1 # One word per line
strings -n4 # Require min 4 ASCII printable characters
egrep -i [a-z] # Require at least one alphanumeric character
sort -u # Unique entries only