2 examples for apt

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  # show various technical information about the 'firefox' package,
# as well as a short description
apt show firefox
  Submitted by anonymous user over 10 years ago [permalink]
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  # In conjuction with sudo is a shorthand version of apt-get with a progress bar
# The command below updates the repo (ubuntu type systems)
sudo apt update
  Submitted by anonymous user over 8 years ago [permalink]