Hello oysterperl,

as new user, always remember to show what you already tried, or you risk to obtain back working solutions not suitable for your Perl level, as the following one ;)

cat data-sample.txt

a     b    c    d    e    f    g    h
aa
bb
cc
dd
aa
bb
cc
dd
aa
bb
cc
dd
1    2    3    4    5    6    7    8    9    10    11    12    13    1
+4    15    16

#NB pay attention to windows double quotes!

perl -M"0;$t=qq(\t)" -F"\s+" -le "$.==1?@h=@F:eof?@n=@F:push@l,$F[0]}{
+print$t,join$t,@h;print join$t,shift@l,map{shift@n}1..$#h,$/while@l" 
+    data-sample.txt

        a       b       c       d       e       f       g       h
aa      1       2       3       4       5       6       7       8
bb      9       10      11      12      13      14      15      16
cc
dd
aa
bb
cc
dd
aa
bb
cc
dd

[download]

you can prepend -MO=Deparse to the above to see it a bit de-obfuscated. It uses eskimo greeting and maori farewel (;) from perlsecret

L*

There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

In reply to Re: Cutting text from the end of the file and adding it to the top -- oneliner by Discipulus
in thread Cutting text from the end of the file and adding it to the top by oysterperl

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