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+# Useless cat. Consider 'cmd < file | ..' or 'cmd file | ..' instead.
+
+### Problematic code:
+
+    cat file | tr ' ' _
+
+### Correct code:
+
+    tr ' ' _ < file
+
+### Rationale:
+
+`cat` is a tool for con"cat"enating files. Reading a single file as input to a program is considered a [Useless Use Of Cat (UUOC)](http://en.wikipedia.org/wiki/Cat_(Unix)#Useless_use_of_cat). 
+
+It's more efficient and less roundabout to simply use redirection. This is especially true for programs that can benefit from seekable input, like `tail`. 
+
+Many tools also accept optional filenames, e.g. `grep -q foo file` instead of `cat file | grep -q foo`.
+
+### Contraindications
+
+None.
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