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Missing square braces for a range expression.
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user232326
user232326

tr - translate or delete characters

cat typescript | tr -d [[[:cntrl:]]] 

tr - translate or delete characters

cat typescript | tr -d [:cntrl:] 

tr - translate or delete characters

cat typescript | tr -d [[:cntrl:]] 
added 6 characters in body
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Michael Mrozek
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trtr - translate or delete characters

cat typescript | tr -d [:cntrl:]

cat typescript | tr -d [:cntrl:] 

tr - translate or delete characters

cat typescript | tr -d [:cntrl:]

tr - translate or delete characters

cat typescript | tr -d [:cntrl:] 
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tr - translate or delete characters

cat typescript | tr -d [:cntrl:]