Incrementando valores em uma variável em Shell Script

Fiz um pequeno script para contabilizar algumas ações que não vem ao caso agora. É um contador, no exemplo abaixo a variável cont recebe o valor 0 que irá incrementar até 10 mais abaixo no while “em português enquanto, é utilizado para repetir até aonde vc determinar” no meu código irá contar até 5.
Uma coisa importante é o uso do “let” que avalia expressões aritiméticas.

#!/bin/bash
cont=0;
while [ $cont -lt 5 ]; do
   echo "Contador: $cont";
   let cont=$cont+1;
done

Segue o resultado após executar o script

sh-4.1$ sh contador.sh
Contador: 0
Contador: 1
Contador: 2
Contador: 3
Contador: 4

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