easy learn linux command line-part 27

Today we learn how to use command line for Debug, Force Close, get System Logs, see system history, Monitor Kernel loaded and much other things.

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Monitoring and debugging
Command	Description
# free -m	displays status of RAM in megabytes
# kill -9 process_id	force closure of the process and finish it
# kill -1 process_id	force a process to reload configuration
# last reboot	show history reboot
# lsmod	display kernel loaded
# lsof -p process_id	display a list of files opened by processes
# lsof /home/user1	displays a list of open files in a given path system
# ps -eafw	displays linux tasks
# ps -e -o pid,args --forest	displays linux tasks in a hierarchical mode
# pstree	Shows a tree system processes
# smartctl -A /dev/hda	monitoring reliability of a hard-disk through SMART
# smartctl -i /dev/hda	check if SMART is active on a hard-disk
# strace -c ls >/dev/null	display system calls made and received by a process
# strace -f -e open ls >/dev/null	display library calls
# tail /var/log/dmesg	show events inherent to the process of booting kernel
# tail /var/log/messages	show system events
# top	display linux tasks using most cpu
# watch -n1 'cat /proc/interrupts'	display interrupts in real-time