macOS

Terminal utils #

Mount (linux distro) ISO #

First we attach ISO to system:

hdiutil attach -nomount /path/to/ISO

returns something like this:

/dev/disk2          Apple_partition_scheme
/dev/disk2s1        Apple_partition_map
/dev/disk2s2        Apple_HFS

then mount need device to mountpoint:

mount -t cd9660 /dev/disk2 /path/to/mount

And after usage:

umount /dev/disk2
hdiutil detach disk2

Show CPU info #

# Number of CPU cores
sysctl -n hw.ncpu

# CPU model
sysctl -n machdep.cpu.brand_string

Flush DNS cache #

# Big Sur

sudo dscacheutil -flushcache
sudo killall -HUP mDNSResponder