QUICK REFERENCE

Command Library

Useful Linux, Cisco and MikroTik commands. Press COPY to copy a command.

Linux
whoami

Show current user

Linux
id

Show user and group IDs

Linux
chmod 640 file.txt

Set file permissions

Linux
sudo systemctl restart ssh

Restart SSH service (use only when appropriate)

Linux
journalctl -xe

Inspect recent system logs

Linux
du -sh /var/log

Measure directory size

Cisco
show running-config

Display active device configuration

Cisco
show mac address-table

Inspect learned MAC addresses

Cisco
show spanning-tree vlan 10

Inspect STP for VLAN 10

Cisco
show access-lists

Inspect configured ACLs

MikroTik
/ip firewall filter print stats

Inspect firewall rules and counters

MikroTik
/interface bridge vlan print

Inspect bridge VLAN table

Linux
pwd

Print current working directory

Linux
ls -lah

List files, including hidden files, in long format

Linux
ip addr

Show network interfaces and IP addresses

Linux
ss -tulpn

Show listening TCP/UDP sockets (permissions may vary)

Linux
systemctl status ssh

Inspect SSH service status

Linux
journalctl -u ssh -n 50

Show recent SSH service logs

Linux
df -h

Show filesystem capacity in human-readable units

Linux
lsblk

List block devices

Cisco
show ip interface brief

Summarize interface state and IP addresses

Cisco
show vlan brief

List VLANs and assigned access ports

Cisco
show interfaces trunk

Show trunk ports and VLANs

Cisco
show ip route

Display routing table

Cisco
show ip ospf neighbor

Inspect OSPF neighbor state

Cisco
copy running-config startup-config

Save running configuration

MikroTik
/ip address print

Show configured IP addresses

MikroTik
/ip route print

Show routing table

MikroTik
/ip dhcp-server lease print

List DHCP leases

MikroTik
/ip firewall nat print

Show NAT rules