Logs from android

How to get Logcat logs in terminal

$  su

$  logcat -f /sdcard/logcat.txt

How to get kernel logs

$  su

$ dmesg > /sdcard/dmesg.txt

 Or run "cat /proc/kmsg > /sdcard/kmsg.txt"

of-course , when you need kernel logs you can use this .

How to get last_kmsg log

$  su

$  cat /proc/last_kmsg > /sdcard/last_kmsg.txt

This is really helpful when you phone is rebooted and you want to save last_kmsg log .