• to specify multiple deletes, put a newline in:
  sed -e '1,3d 10,15d'
• or...specifiy multiple -e flags
• sed can also delete lines with specific contents:
  ls -al | sed -e '/swp$/d'
• insert text:
  ls -al | sed -e '4i\I like cheese'
• insert text at beginning:
  ls -al | sed -e '1i\Data for executive report'
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