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sed

  • Replace foo with bar in a file :)
 sed -i 's/foo/bar/g' /some/path/file.txt

Replace "dark" or "somecrap" or "light" to "boles"

 sed -i 's/dark/boles/g;s/somecrap/boles/g;s/light/boles/g' /some/path/file.txt
  • Delete line using matching patterns in a line
sed -i '/pattern-to-match/d' ./some/file
  • Mach based on part of a pattern
sed -i '/backend=/c\  export backend=soemthing' somefile