Single LineFrom Nth to Mth LinesFrom the Last Nth to the Last Mth Lines
Every Nth Line of a FileEvery N Lines of a FileEvery Line

Single Line
  1. Get the 4th line of a file. 2000.09.29
From Nth to Mth Lines
  1. Get the 3rd through 6th lines of a file. 2000.09.29
  2. Delete the 3rd through 6th lines of a file. 2000.09.29
  3. Get the last 6 lines of a file. 2006.07.14
  4. Delete the last 6 lines of a file. 2000.09.29
From the Last Nth to the Last Mth Lines
  1. Delete the last 8th through 4th lines of a file. 2012.01.05
Every Nth Line of a File
  1. Get every Nth line of a file. 2009.05.15
  2. Append a line after every Nth (for example, 4th) line. 2001.02.22
  3. Delete every 4th line (e.g., 4th, 8th, 12th, ...) of a file. 2006.02.22
Every N Lines of a File
  1. Join every N lines to one. 2009.09.15
Every Line
  1. For each line of a file, append the previous line to the end of it. 2004.10.14
  2. For each line of a file, append the next line to the end of it. 2005.01.28
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