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Shell Programming and Scripting

Switching lines

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# 1  
Old 05-30-2011
Switching lines
Hi
I'm quite new with linux.
Very simple, I need to swap every 2 lines in a file.
Example

INPUT:
Code:
a a a 
b b b
x x x 
y y y 
s s s
t t t

OUTPUT:
Code:
b b b
a a a
y y y 
x x x 
t t t
s s s

# 2  
Old 05-30-2011
One way would be..
Code:
awk '{s=$0;getline;print $0"\n" s}' inputfile > outfile

This User Gave Thanks to michaelrozar17 For This Post:
hernand
# 3  
Old 05-30-2011
Code:
sed -n 'h; n; G; p'

If you'd prefer to keep the last line when there are an odd number of lines:
Code:
sed -n '$p; h; n; G; p'

Regards,
Alister
Last edited by alister; 05-30-2011 at 12:31 PM..
This User Gave Thanks to alister For This Post:
hernand
# 4  
Old 05-30-2011
Code:
awk 'getline x{print x}1' infile

This User Gave Thanks to Scrutinizer For This Post:
hernand
# 5  
Old 05-30-2011
Code:
perl -0pe 's/(.*\n)(.*\n)/\2\1/g' file

This User Gave Thanks to bartus11 For This Post:
hernand
# 6  
Old 06-06-2011
Thanks all
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