Linux - quick
lsb_release -a // ubutu version
From anywhere in the desktop - Cntl + Alt +T to get a terminal.
lspci //pci devices
lscpu
lshw -short
hwinfo
lsscsi
lsusb
inxi
dmidecode
# display information about the processor/cpu
$ sudo dmidecode -t processor
# memory/ram information
$ sudo dmidecode -t memory
# bios details
$ sudo dmidecode -t bios
lsblk
df
sudo fdisk -l
pydf
mount
free -m
# cpu information
$ cat /proc/cpuinfo
# memory information
$ cat /proc/meminfo
cat /proc/version
$ cat /proc/partitions major minor #blocks name 8 0 488386584 sda 8 1 73400953 sda1 8 2 1 sda2 8 5 102406311 sda5 8 6 102406311 sda6 8 7 1998848 sda7 8 8 208171008 sda8 11 0 1048575 sr0ps commands --$ sudo hdparm -i /dev/sda
ps aux
ps -ef
Use the "u" option or "-f" option to display detailed information about the processes
ps aux
ps -ef -f
To filter the processes by the owning user use the "-u" option followed by the username.
Multiple usernames can be provided separated by a comma.
$ ps -f -u www-data
To search the processes by their name or command use the "-C" option followed by the search term.
ps -C apache2
To display processes by process id, use the "-p" option and provides the process ids separated by comma.
$ ps -f -p 3150,7298,6544
Sort process by cpu or memory usage
$ ps aux --sort=-pcpu,+pmem
Display the top 5 processes consuming most of the cpu.
$ ps aux --sort=-pcpu | head -5
Display process hierarchy in a tree style
$ ps -f --forest -C apache2
Display child processes of a parent process
$ ps -o pid,uname,comm -C apache2
Display threads of a process
$ ps -p 3150 -L
Change the columns to display
ps -e -o pid,uname,pcpu,pmem,comm
$ ps -e -o pid,uname=USERNAME,pcpu=CPU_USAGE,pmem,comm
Display elapsed time of processes
$ ps -e -o pid,comm,etime
Turn ps into an realtime process viewer
watch -n 1 'ps -e -o pid,uname,cmd,pmem,pcpu --sort=-pmem,-pcpu | head -15'
Prokash Sinha