Add the clean command.

Sometimes it is useful to remove temporary files from a directory. I
used to do this with a shell script located in /usr/bin/, however that
wasn't very convenient. Putting the script in the .zshrc allows to
maintains the very small script with all the dotfiles instead of copying
the script from machines to machines.

.zshrc

@@ -81,3 +81,28 @@ if hash dig 2>/dev/null; then
         fi
     }
 fi
+
+clean()
+{
+    clean_dir()
+    {
+        local dir="$1"
+        if [ -d "$dir" ]; then
+            find "$dir" -name "*~" -print -delete
+            find "$dir" -name ".*~" -print -delete
+            find "$dir" -name "#*#" -print -delete
+        else
+            echo "$dir: not a directory"
+        fi
+    }
+
+    if [ $# -ne 0 ]; then
+        for dir in "$@"; do
+            clean_dir "$dir"
+        done
+    else
+        clean_dir "./"
+    fi
+
+    unfunction clean_dir
+}