add Google shell style guide

diff --git a/doc/safe-shell.mdwn b/doc/safe-shell.mdwn
index ff2dde840b9bb467c44209a2e641e2cf4a58d19e..7b24040f27a906a60df551fbf105c2c4fb4f289f 100644 (file)
--- a/doc/safe-shell.mdwn
+++ b/doc/safe-shell.mdwn
@@ -112,6 +112,10 @@ Another approach is to prefix each filename with `./`, if the filenames are expe
 
 TODO: mumble `mktemp`?
 
+## Other resources
+
+Google has a [Shell Style Guide](http://google-styleguide.googlecode.com/svn/trunk/shell.xml). As the name suggests, it primarily focuses on good style, but some items are safety/security-relevant.
+
 ## Conclusion
 
 When possible, instead of writing a "safe" shell script, *use a higher-level