On 8 January 2016 at 08:44, Yi Zhao <yi.zhao@windriver.com> wrote:

It still need to escape quotation marks if using -F option.
Consider the following log:
[521514.737] (EE) evdev: Qemu Tablet: Unable to open evdev device "/dev/input/touchscreen0".

We still need an extra step to replace " with \" before grep

Actually that's only true as the grep command is passed to subproces.check_output() as a string.  If it was constructed as a list the shell wouldn't be parsing it and you wouldn't have to worry about quoting at all.

(always pass lists instead of strings to subprocess, it makes everything a lot easier)

Ross