---
title: Linux
tags: note software linux
created: 2023-07-01T08:51:23Z
published: true
---

The following commands have been tested with Arch Linux.
They might work in other distributions with a few modifications.
The commands assume standard user permissions and will include `sudo` if root permissions are required.

## lsof

### List open TCP connections

```bash
sudo lsof -PniTCP
```

### List open UDP connections

```bash
sudo lsof -PniUDP
```

## nu

### Sort files and directories by size

```bash
ls -ad | sort-by size | reverse
```

### Filter processes with a high cpu usage

```bash
ps | where cpu > 0 | sort-by cpu | reverse
```

### Filter processes with a high memory usage

```bash
ps | where mem > 30MB | sort-by mem | reverse
```

## openssl

### Show certificate info

```bash
openssl x509 -text -noout -in $file
```

## pacman

### Install a package

```bash
sudo pacman -S $package
```

### Uninstall a package and its dependencies

```bash
sudo pacman -Rs $package
```

### List installed packages

```bash
pacman -Q
```

### List orphaned packages

```bash
pacman -Qtdq
```

### Clear cache

```bash
sudo pacman -Sc
```

## rg

### Search recursively

```bash
rg $text
```

### Search single file

```bash
rg $text $file
```

### Disable all filters

```bash
rg -uuu $text
```

## rsync

### Sync directory with a server

```bash
rsync -avz $source $destination
```

### Preview changes

```bash
rsync -avz $source $destination --dry-run
```

## systemd

### List all running services

```bash
systemctl --type=service --state=running
```

### List all enabled services

```bash
systemctl list-unit-files --type=service --state=enabled
```

### Follow log messages

```bash
journalctl -f
```

### Follow log messages for a specific unit

```bash
journalctl -f -u $unit
```

### Show boot time analysis

```bash
systemd-analyze blame
```

### Reboot into BIOS

```bash
systemctl reboot --firmware-setup
```

## tar

### Compress ze vucking files

```bash
tar czvf $name.tar.gz .
```

### Extract ze vucking files

```bash
tar xzvf $name.tar.gz
```

## users

### Add a user

```bash
useradd -m $user
```

### Add a group to a user

```bash
usermod -aG $group $user
```

## wmctrl

### Close all windows

```bash
wmctrl -l | awk '{print $1}' | xargs -rn1 wmctrl -ic
```