Merge pull request #246 from NegaMorgan/master

adding ack

pages/common/ack.md

@@ -0,0 +1,19 @@
+# ack
+
+> A search tool like grep, optimized for programmers.
+
+- Find files containing "foo"
+
+`ack {{foo}}`
+
+- Find files in a specific language
+
+`ack --ruby {{each_with_object}}`
+
+- Count the total number of matches for the term "foo"
+
+`ack -ch {{foo}}`
+
+- Show the file names containing "foo" and number of matches in each file
+
+`ack -cl {{foo}}`