Update commands.py

[gypsymauro]

if you change the grep option -e with -E you can use more advanced regexp like (foo|bar) or foo.*bar to inlcude just lines that contains foo OR bar strings or, in the second case, foo AND bar useful in very big syslog files ;). It will be nice to have an help page with some examples like those, and the possibility to save some searches

[gvalkov]

Thanks. I like the idea, but I'm thinking of taking it a step further and making the commands fully configurable. I'll leave this open for now.