[SOLVED] -bash: pihole: command not found

pi@raspberrypi:~ $ sudo apt-get update
Get:1 Index of /raspbian stretch InRelease [15.0 kB]
Get:2 Index of /raspbian stretch/main armhf Packages [11.7 MB]
Hit:3 Index of /debian stretch InRelease
Fetched 11.7 MB in 47s (245 kB/s)
Reading package lists... Done