Пример использования команды alias для bash:

$ alias pingoogle="ping -c3 8.8.8.8"

Теперь по команде pingoogle будут пропингованы dns-серверы google:

pi@raspberrypi ~ $ pingoogle 
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
From 192.168.1.30 icmp_seq=1 Destination Host Unreachable
From 192.168.1.30 icmp_seq=2 Destination Host Unreachable
From 192.168.1.30 icmp_seq=3 Destination Host Unreachable

--- 8.8.8.8 ping statistics ---
3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2005ms
pipe 3