Subject: bug#36820: grep "[[:cntrl:]]" /proc/1/cmdline works on 2.20 but not 3.3

From: Paul Eggert <[email-masked]>
Date: Sun, 28 Jul 2019 17:59:51 -0500

On 7/28/19 3:04 AM, Jeff Chua wrote:
> Then if it's binary file, grep should default to "-a" 

No, as that would mean the default output of grep would not be text, and 
this could mess up terminals etc. This is partly why -a has never been 
the default. If you want -a behavior you can use -a.