tail -f /var/log/messages #following debug messages from the kernel
grep "define __NR" unistd.h | wc -l #count system calls on a kernel
dmesg #display kernel debugs from RAM
journalctl -t kernel #show systemd journaling about kernel
journalctl -f #monitor journaling generated by the systemd
grep MemTotal  /proc/meminfo #get memory available to kernel
uname -r #display kernel version
ls -l /boot/kerne* #get size of the kernel image
strace -c date #monitor all system calls of a program/command with the kernel
strace sh sscript.sh #monitor sys calls inside a script / builtin commands on bash /etc
strace ./script /etc #same as above along with args to script
grep -i ethernet file #ignore case/capitalization
sudo sysctl -a | grep ip_forward # get config from /proc/sys
## start : check kernel command args put by the grub during booting
cat /proc/cmdline
dmesg | grep -i command
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