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 N-th line through the LAST M-th line of a datafile, where N is greater than M. 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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