you need to know the number of files (-f is true) in a the current directory, and you want to do it in one line--here's your chance!

it works by printing the number of entities processed - the number of entities that are that are not files (!-f)

Update: fixed thanks to jmcnamara

perl -e'opendir(D,shift)?print((map{$i+=!-f}readdir(D))-$i):die' your_
+dir_here

[download]
 
perl -le'opendir(D,".")?print((map{$i+=!-f}readdir(D))-$i):die'

[download]

In reply to number of files in current directory - one liner by particle

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