Basic Linux Commands
copy
Cut
Delete
see directory items
zipping & unzipping
System info
- hmesg
- To Know PCI device information
lspci
- To know CPU information
lscpu
- To know how many disk/drives present in system
lsblk
- To know how much disk space used
df -H - How much RAM present /used/free
free -m
This will show in megabyte. -g can be used for gigabyte & -k can be used for killobyte.
Network Tools
- To know which services using which ports
cat /etc/services
- How to check if a port is in use on Linux
sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN
sudo ss -tulpn | grep ':22'
- How can you find out which process is listening on a port on Linux
sudo netstat -tulpn | grep :443
sudo ss -tulpn | grep ':22'
Options
- -t : Display TCP sockets/port
- -u : Show UDP sockets/port
- -l : See only listening sockets i.e. open port
- -p : Also display process name that opened port/socket
- -n : View addresses and port numbers in a numerical format. Do not use DNS to resolve names.
How to use Grep
Process Monitoring
- PS
- kill
- top
- stop
Spatial commands
- cat
- clear
- less
- head
- tail
- wc
- chown
- chmod