3 examples for apt-get

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  # Install Packages: Ruby Gem & Nano.
sudo apt-get install gem nano

# Remove Packages(keep configuration files)
sudo apt-get remove gem nano

# Remove Packages(remove configuration files)
sudo apt-get purge gem nano

# Get Updated Package Index Files(Always Use Before Upgrade)
sudo apt-get update

# Upgrade All Packages
sudo apt-get upgrade
  Submitted by anonymous user over 11 years ago [permalink]
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  # get source for package something in current working directory 
apt-get source something
  Submitted by anonymous user almost 10 years ago [permalink]
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  # Acquire anything out of thin air.
apt-get install wife money respect house car warm-weather private-jet vacation-home pile-of-gold computer
  Submitted by anonymous user over 11 years ago [permalink]