Bash function to extract any compressed file. Code snippet stolen from @robinandeer - https://github.com/robinandeer/dotfiles

.bashrc

# One command to extract them all
extract () {
  if [ $# -ne 1 ]
  then
    echo "Error: No file specified."
    return 1
  fi
  if [ -f $1 ] ; then
    case $1 in
      *.tar.bz2) tar xvjf $1   ;;
      *.tar.gz)  tar xvzf $1   ;;
      *.bz2)     bunzip2 $1    ;;
      *.rar)     unrar x $1    ;;
      *.gz)      gunzip $1     ;;
      *.tar)     tar xvf $1    ;;
      *.tbz2)    tar xvjf $1   ;;
      *.tgz)     tar xvzf $1   ;;
      *.zip)     unzip $1      ;;
      *.Z)       uncompress $1 ;;
      *.7z)      7z x $1       ;;
      *)         echo "'$1' cannot be extracted via extract" ;;
    esac
  else
    echo "'$1' is not a valid file"
  fi
}

Nice idea, but the calls to tar can be simplified. GNU tar already recognizes lots of compressed file formats automatically, no need to specify it explicitly. Just write tar xv file.tar.bz2, for example. The extension that's used doesn't matter, so the name could also be file.tbz2 or file.tbz (or anything else). This works for (at least) gzip, bz2, lzo, xz, Z formats.