• Replace a line with specific text:
  ls -al | sed -e '/swp$/c\TEMPORARY FILE'
• only want to change a few words?
• replace first occurance on any line:
  ls -al | sed -e 's/old/new'
• replace all occurances on any line:
  ls -al | sed -e 's/old/new/g'
• combine with search!
• ls -al | sed -e'/html$/s/rw-r--r--/644/'
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