Background logcat with filter I have an app which seems to crash sometimes but of course not at that time when I have it connected to my PC and run logcat.

Is there a good method of grepping logcat in background (best would be filter by app but filter by text would already be helpful) and write the logfile to SD card for later inspection?
You could use a logcat app that writes the log to your sd card. Depending on the Android version on your device, that might require root permissions: latest with Android 4.2 "normal apps" only can see their own log. Checkout my list for Logcat &amp; Co. for possible candidates. I know that e.g. aLogCat has the feature I've described. It also has filtering capabilities. Same applies to several other candidates of the linked list.