How to count the lines of an output in the terminal?

Question

I want to count the total outputs of the results in the terminal.

For example using the cat lista_de_compras.txt:

arroz
feijão
leite

I want to receive 3

Answer 1

Use the grep:

grep -c ^ lista_de_compras.txt

The exit will be 3

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or user the cat with the wc

cat lista_de_compras.txt |wc -l

The exit will be 3

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Or just use the wc:

wc -l lista_de_compras.txt

The exit will be 3

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