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I think the typical way to do this uses [`wc`][wc] ("word count"?) and the `-l` option.
```sh
~~cat /path/to/file | wc -l~~
```
`wc` with no options prints the number of lines, words, and bytes, but `-l` can limit it to just lines.
[wc]: https://linux.die.net/man/1/wc

I think the typical way to do this uses [`wc`][wc] ("word count"?) and the `-l` option.
```sh
wc -l </path/to/file
```
`wc` with no options prints the number of lines, words, and bytes, but `-l` can limit it to just lines.
[wc]: https://linux.die.net/man/1/wc