this is one:

ls -l . | egrep -c '^-'

Note:

ls -1 | wc -l

Which means: ls: list files in dir

-1: (that’s a ONE) only one entry per line. Change it to -1a if you want hidden files too

| : pipe output onto…

wc: “wordcount”

-l: count lines.

Source: Count number of files within a directory in Linux (not using wc) – Stack Overflow

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