Update cheatsheets

ag

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ag
+
+> The Silver Searcher. Like `ack`, but aims to be faster.
+> More information: <https://github.com/ggreer/the_silver_searcher>.
+
+- Find files containing "foo", and print the line matches in context:
+
+`ag {{foo}}`
+
+- Find files containing "foo" in a specific directory:
+
+`ag {{foo}} {{path/to/directory}}`
+
+- Find files containing "foo", but only [l]ist the filenames:
+
+`ag -l {{foo}}`
+
+- Find files containing "FOO" case-[i]nsensitively, and print [o]nly the match, rather than the whole line:
+
+`ag -i -o {{FOO}}`
+
+- Find "foo" in files with a name matching "bar":
+
+`ag {{foo}} -G {{bar}}`
+
+- Find files whose contents match a regular expression:
+
+`ag '{{^ba(r|z)$}}'`
+
+- Find files with a name matching "foo":
+
+`ag -g {{foo}}`