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Is there a way to read a file backwards, line by line, without having to go through the file from the beginning to start reading backwards?
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An efficient solution to read a file in reverse order is, Start reading the file from last and continue till the start of the file i.e. in reverse order. As soon as it encounter any '\n' then it means, a complete line is read.
Tac. Another exciting way to display the contents of a file in Linux is in reverse order. To do so, use the tac command. It is similar to cat but reversed, reading and displaying the file starting from the last line.
To open a file using less, type the less command followed by the file name. You can search for text with vi commands such as / (look forward) and ? (look backward). You can page down with f (forward) and up with b (backward).
Use a memory-mapped file and walk backwards. The OS will page in the needed parts of the file in reverse order.
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