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Folha de dicas do Ubuntu (APT e Systemd)

Guia rápido para Ubuntu e Debian Linux: gerenciamento de pacotes APT, utilitários dpkg, controle de serviços systemd e limpeza de cache.

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Gerenciamento de pacotes com APT e Dpkg

Comandos APT

# Update repository package indexes
sudo apt update

# Upgrade installed packages to newest versions
sudo apt upgrade -y

# Search for a package by keyword
apt search nginx

# Install package
sudo apt install nginx -y

# Remove package keeping configuration
sudo apt remove nginx

# Purge package and configuration files
sudo apt purge nginx

Comandos Dpkg

# Identify which package owns a specific binary or file
dpkg -S $(which nginx)

# List all files installed by a package
dpkg -L nginx

# Install a local .deb package file
sudo dpkg -i package.deb

# Show status and details of installed package
dpkg -s nginx

# List all installed packages
dpkg --get-selections

Cache de pacotes

Os arquivos de pacotes baixados ficam em cache em:

/var/cache/apt/archives/

Limpar pacotes obsoletos do cache:

sudo apt clean
sudo apt autoremove -y

Gerenciamento de serviços com Systemd

# Check service status
systemctl status nginx

# Start / stop / restart service
sudo systemctl start nginx
sudo systemctl stop nginx
sudo systemctl restart nginx

# Enable service to launch at system boot
sudo systemctl enable nginx

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