Linux useful commands
memory
free -m
sar -a 2 2
ps -eo pid,cmd,%mem,%cpu --sort=-%mem | head
CPU
sar -u 3 3
ps -eo pid,cmd,%mem,%cpu --sort=-%cpu | head
top
process
ps -e --forest | grep sshd
lsof -p pid
disk and files
df -hP
du -h
ls -i
ls -ltr
state file
fuser filename
lsof filename
network
ss -altp | grep
nestat -altp | grep
fuser -v -k -n tcp 80
lsof -i :80
dig
nslookup
grep tcp/80 /etc/services
iptable
accounts and permission
w
last
id userid
chage -l userid
chage -M -1 userid
chmod 775 file
chmod -R 775 folder
chwon root. file
history
system
init 6
reboot
shutdown -h +10
shutdown -r now
halt
poweroff -f
df -pH
fdisk -l
free -mh
sar -u 2 2
sar -
cpu
lsof -i 80
lsof -p pid
fuser -v
ps aux | grep httpd
ps -eo pid,com,%mem,%cpu
ps -e —forest
top
ss -altp
ls -i
ls -ltr
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