Linux and Unix useful command list, mini version, ping, netstat, ifconfig iptables

Unix/Linux useful commands, mini version

For troubleshooting a Linux system you might,
want to try one of the following Linux commands.
These commands and flags might not be viable on everyones system.

# lspci list all your pci devices
# dhclient eth0 renew your dhcp release
# ifconfig wlan0 check your wireless network configuration
# netstat -arn show your network route information
# netstat -ap 2 | grep EST show established connections, updates every 2 sec
# netstat -Cr print routing information from routing cache
# iptables -nL show your current iptables configuration in numeric form
# ping ping 127.0.0.1 or network ip address for ICMP replies
# ping -c ping X times.
# ping6 ping ipv6 addresses
# dmesg print or control the kernel ring buffer, bootup messages
# dmesg | grep eth0 if you missed the bootup sequence, and need to check eth0
# nmap -vvv localhost scan yourself for open ports, vvv = extra verbose
# ssh secure shell, encrypted remote login program, client
# ssh -l user host ssh as user to host, ssh -l donald server1.sshexample.com
# uptime check your linux servers uptime and load