[ale] Move last line of a file to first line

[Lightner, Jeff]

I found this works:
awk '{a[NR]=$0} END {print a[NR]; for (i=1;i<NR;i++) print a[i]}' originalfile >newfile

Where you replace originalfile and newfile with real file names.



________________________________
From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of Lightner, Jeff
Sent: Wednesday, March 28, 2012 11:10 AM
To: Atlanta Linux Enthusiasts
Subject: [ale] Move last line of a file to first line

We have variable length text files being received in which the "header" line we use in automated processing is the last line of the file rather than the first line.

What is the best way to move that last line of a text file to be the first line?

Please answer the question as asked and don't suggest making the file be in the correct order when we receive it or changing the automated processing to read the last line first.  Assume those aren't options.

What I came up with was to do tail -1 >newfile and head -<number of lines - 1> but was thinking there ought to be a better way.

I see sed can deal with last line, first line and insertion but the examples I'm finding address either/or not moving last line to first line.









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