Comments on How to count the lines of a file?
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I think the typical way to do this uses wc ("word count") with the -l ("lines") option.
$ wc -l /path/to/file
47 /path/to/file
$ wc -l </path/to/file
47
$ cat /path/to/file | wc -l
47
wc with no options prints the number of lines, words, and bytes, but -l can limit it to just lines. As a comment notes: "lines" is the number of newline characters, so you may be off-by-one if you don't have a trailing newline.
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