Put char with sed

put char on position X with sed
 
put space on position 5
echo 1234567 | sed 's/./& /5'

put . on position 5
echo 1234567 | sed 's/./&./5'
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Controle de acesso SSH com hosts.deny e hosts.allow

  Faça login na sua máquina Linux e abra uma janela de terminal. Primeiro, vamos negar todo o acesso ao daemon SSH. Abra o arquivo hosts.den...

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