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Quick FreeBSD Tricks

In several places, I have simply inserted the code as a script to be downloaded. I tend to keep things like this around so I can just run a simple command instead of copying/pasting an entire line.

Hardware Devices

To locate all attached drives, scan dmesg.boot
#! /bin/sh
egrep '(ad|cd|da)[0-9]' /var/run/dmesg.boot | sort

Or, simply run

geom disk list

List USB devices



CPU Temperatures

Following command will show you the temperature of each core of a processor

sysctl -a | grep temperature | grep cpu

iotop substitute

iotop is a well known utility under Linux, but not available for FreeBSD. However, the following command will do the same thing (does not apparently work for iSCSI devices)

top -m io -o total

watch substitute

Under Linux, watch repeats a command over and over, so it is useful for monitoring long running processes. The FreeBSD command cmdwatch does the same thing, with the same flags.

cmdwatch zpool iostat -v

Package Management

setting pkg to not ask permission

I was used to Debian's apt-get, and used the -y (answer “Yes” to all questions) parameter. Looking for something similar for pkg, I ran across which showed a possible answer; set an environmental variable as part of the call.

env ASSUME_ALWAYS_YES=YES pkg install p5-libwww

will install LWP (p5-libwww) without waiting for you to select “Yes”

clean pkg cache

After a while, your pkg cache will use more and more space on your disk, with copies of packages you have already installed. The following command cleans that cache.

pkg clean

User Administration

Administrative Permission

By default, a new user is not able to become root. To do this, you must add them to the wheel group. Use the following command

pw user  mod  username -G wheel

where username is the username of the user who has access

Changing Shell

I just like bash for my shell. While it is not the standard for BSD, it is much more powerful than the standard sh, so I like to use it for my personal account. Once bash is installed, set it as the default shell for a user.

chsh -s bash username

Warning: do not modify the root account's shell. You will break your system. If you want a bash script to run as root, be sure to include

#! /usr/bin/env bash

at the head of your scripts.

zfs tricks

  • zfs unshare -a
  • zfs share -a
  • showmount -e
unix/freebsd/quick_tips.txt · Last modified: 2023/11/23 01:03 by rodolico