Which of the following commands will reduce all consecutive spaces down to a single space?
A
tr '\s' ' ' < a.txt > b.txt
B
tr -c ' ' < a.txt > b.txt
C
tr -d ' ' < a.txt > b.txt
D
tr -r ' ' '
' < a.txt > b.txt
E
tr -s ' ' < a.txt > b.txt
Correta
Explicação Oficial / Explicações da Comunidade
The -s (squeeze-repeats) option of the tr command replaces each input sequence of a repeated character that is listed in the set with a single occurrence of that character.
