I would like to replace all non-printable char and space and question mark to nothing.
sed 's/[^[:print:]\|?\| \r\t]//g'
but this will only replace non-printable char. The space and the question mark remains.
A pipe in the bracket expression means a pipe, not an alternation operator.
You can use
sed -E 's/[^[:print:]]|[[:blank:]?]//g' file > outfile
Here,
-E enables the POSIX ERE syntax[^[:print:]] - any non-printable char| - or (here, due to -E and the fact it is outside a bracket expression, it is an alternation operator [[:blank:]?] - a horizontal whitesapce or question mark.You may chain two commands if you want to use POSIX BRE:
sed 's/[^[:print:]]//g;s/[[:blank:]?]//g' file > outfile
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