Linux/OpenBSD Cheatsheet

Nov 04, 2023

Linux and OpenBSD do share a great deal of common commands and core utilities, albeit with different implementations. However, there are some obvious differences, due to the ways these systems work. This page contains a cheatsheet for common commands, operations and files on OpenBSD and Linux (primarily Red Hat family) systems, which covers some of these differences.

General Commands

Linux	OpenBSD
`sudo`	`doas`
`sudo su`	`doas su`
`lsof`	`fstat`
`lsblk`	`sysctl hw.disknames`
`ip a`	`ifconfig`
`lspci`	`pcidump`
`adduser <username>`	`useradd -m <username>`
`deluser <username>`	`userdel <username>`

Service Management

Linux	OpenBSD
`systemctl stop <service>`	`rcctl stop <service>`
`systemctl start <service>`	`rcctl start <service>`
`systemctl status <service>`	`rcctl check <service>`
`systemctl reload <service>`	`rcctl reload <service>`
`systemctl enable <service>`	`rcctl enable <service>`
`systemctl disable <service>`	`rcctl disable <service>`
`systemctl restart <service>`	`rcctl restart <service>`
`systemctl list-units --type=service`	`rcctl ls all`
`systemctl list-units --type=service --state=running`	`rcctl ls started`
`systemctl list-units --type=service --state=enabled`	`rcctl ls on`

Firewall & Networking

Linux	OpenBSD
`systemctl reload firewalld`	`pfctl -f /etc/pf.conf`
`systemctl enable firewalld`	`pfctl -e`
`systemctl disable firewalld`	`pfctl -d`
`firewall-cmd --list-all`	`pfctl -sr`
`firewall-cmd --add-port=...`	`vi /etc/pf.conf`
`firewall-cmd --runtime-to-permanent`	-
`systemctl restart network`	`sh /etc/netstart`
`less /var/log/firewalld`	`tcpdump -n -e -ttt -r /var/log/pflog`

Packages & Upgrades

Linux	OpenBSD
`yum/dnf install`	`pkg_add`
`yum/dnf update`	`pkg_add -u`
`yum/dnf remove`	`pkg_delete`
`yum/dnf autoremove`	`pkg_delete -a`
`yum/dnf search`	`pkg_info -Q`
`-`	`syspatch -c`
`-`	`syspatch`
`system-upgrade/dist-upgrade`	`sysupgrade`

Important Files

Linux	OpenBSD
`.bashrc`	`.kshrc`
`/etc/sudoers`	`/etc/doas.conf`
`/etc/sysconfig/network-scripts/ifcfg-<interface>`	`/etc/hostname.<interface>`
`/etc/firewalld/firewalld.conf`	`/etc/pf.conf`
`/var/log/secure`	`/var/log/authlog`
`/var/log/nginx`	`/var/www/logs`