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If you want to extract kernel logs from the android shell and are getting 'Permission Denied' errors, you can use this approach: Go into the adb shell and run: cat /proc/last_kmsg >/sdcard/last_kmsg. Now come out of the shell and run: adb pull /sdcard/last_kmsg This will extract the logs to the folder containing the adb exe!

Let's say you want to search for the text 'amigo' within a directory. You can use: grep -r 'amigo' /home/guest/mydir. If you start getting errors like 'No such file or directory' and you want to ignore them, the option -s can be used. So it'll become grep -r  -s 'amigo' /home/guest/mydir. Here -r is for recursive search within a directory and -s for skipping error messages. And if we want to exclude searching certain type of files, like SVN and xml files, we can use: grep -r -s -n --exclude=*.{svn*,xml} 'PATTERN' . Another useful feature is if we want to exclude certain directories from the search altogether. For this we can use  --exclude-dir=Tests .