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Shell Programming and Scripting

Sequence in one single line

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# 8  
Old 06-19-2010
Quote:
Originally Posted by danmero
What about this one ?
Code:
awk '{printf (/^>/)?((NR==1)?x:RS)$0 RS:$0}' file


Yep, nice!

However using printf without the format specifier could be dangerous. If the input contains special (for printf) characters the code could fail:


Code:
% print %d | awk '{ printf $0 }'
awk: (FILENAME=- FNR=1) fatal: not enough arguments to satisfy format string
        `%d'
          ^ ran out for this one

So, it would be a bit safer to add the format specifier (I also added the final newline):

Code:
awk 'END { print x }
  { 
    printf "%s", /^>/ ? (NR == 1 ? x : RS) $0 RS : $0
     }' infile

P.S. If I recall correctly some awk implementations (nawk on Solaris?) would require more parens., just like in your post.
Last edited by radoulov; 06-19-2010 at 06:16 AM..
# 9  
Old 06-19-2010
Quote:
Originally Posted by radoulov
However using printf without the format specifier could be dangerous. If the input contains special (for printf) characters the code could fail:
You are correct (as always), I just drop this "short" oneliner at 3:21 AM Smilie
# 10  
Old 06-19-2010
Hi


Code:
sed -e :a -e '/^>/!N;s/\n[^>]/ /;ta' file

Guru.
# 11  
Old 06-19-2010
Quote:
Originally Posted by guruprasadpr
Hi


Code:
sed -e :a -e '/^>/!N;s/\n[^>]/ /;ta' file

Guru.
Very nice Smilie

P.S. It seems that the OP asks for:

Code:
s/\n[^>]//



---------- Post updated at 11:52 AM ---------- Previous update was at 11:48 AM ----------
Quote:
Originally Posted by danmero
[...]I just drop this "short" oneliner at 3:21 AM Smilie
Yes, it's not fair Smilie
It's 11.51 AM here Smilie
This User Gave Thanks to radoulov For This Post:
Xterra
# 12  
Old 06-19-2010
Quote:
Originally Posted by radoulov
Yes, it's not fair Smilie
It's 11.51 AM here Smilie
Yep, I know..

Quote:
Originally Posted by radoulov
Very nice Smilie

P.S. It seems that the OP asks for:
Maybe we should run a diff for each output. My is missing the last new line only.
guruprasadpr solution look nice but no go.
# 13  
Old 06-19-2010
Quote:
Originally Posted by danmero
[...]
Maybe we should run a diff for each output. My is missing the last new line only.
guruprasadpr solution look nice but no go.
Yep,
I overlooked that, the sed solution gives a different result.
# 14  
Old 06-19-2010
@Radoulov

The 'sed' solution gives the result as expected in the 'output' attachment. What is it missing?

Guru.
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