Customising UNIX environment

• Creating/changing a user-defined variable:

  garfield@decunx:~[xx]$ good="bad"
  
  garfield@decunx:~[xx]$ echo $good
  bad
  garfield@decunx:~[xx]$ xyz="$HOME"
  garfield@decunx:~[xx]$ echo $xyz
  /home/stu99/garfield

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