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lang-bash
ddis for Disk Dumps, thus contains binary data. It's unlikely you have to grep such a file... If you really want to, you may try to find only characters strings in that file then grep them:strings file.dd | grep ...If your file is actually only text, you may split it in several smaller files, for instance:split -n 500000 file.dd(man split) then grep the generated files (which are by defaultaa,ab,ac, ...)