Types
The three most important log types are:
logcat: the logoutput of the Android system
radio logcat: the log outpur ot your System / BB / RIL communication
kernel log (kmsg / dmesg): the kernel messages
Additionally there’s the last_kmsg which is a dump of the kernel log until the last shutdown.
Normal Logcat:
adb logcat -v time -d > logcat.log
Radio Logcat:
adb logcat -b radio -v time -d > logcat_radio.log
Note: Cyanogenmod (based) ROMs require the following setting to export kernel logs via adb:
Settings - Developer Options - Root access - choose: “Apps and ADB”
Kernel Log: