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Merging lines using AWK

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# 1  
Old 03-04-2008
Merging lines using AWK
Hi,

Anybody help on this. Smilie

I want to merge the line with previous line, if the line starts with 7.
Otherwise No change in the line.

Example file aa.txt is like below

122122
222222
333333
734834
702923
389898
790909
712345
999999

My output should be written in another file called bb.txt

122122
222222
333333734834702923
389898790909712345
999999

Your help is very much appriciated.
Last edited by senthil_is; 03-04-2008 at 11:19 PM.. Reason: change
# 2  
Old 03-05-2008
Code:
awk 'BEGIN{t=""}
{
if ($1 ~ /^7/)
	t=sprintf("%s%s",t,$1)
else
	t=sprintf("%s\n%s",t,$1)
}
END{
print t
}' filename

# 3  
Old 03-05-2008
Smilie Thanks summer.

The output is coming with one blank line in the header.

# Here blank line is coming.
122122
222222
333333734834702923
389898790909712345
999999

How to avoid and how to redirect to another file.
# 4  
Old 03-05-2008
One way:

Code:
awk '
NR>1 && substr($0,1,1)!=7{printf("\n")}
{printf("%s",$0)}
END{if(substr($0,1,1)!=7){printf("\n")}}
' file

Regards
# 5  
Old 03-05-2008
Another:

Code:
awk 'END{print RS}$0=(NR>1&&!/^7/)?RS$0:$0' ORS= file>new

Use nawk or /usr/xpg4/bin/awk on Solaris.
# 6  
Old 03-05-2008
Did you want an extra blank line at the end of the file? If not
Code:
 awk '$0=(NR>1&&!/^7/)?RS$0:$0' ORS= file

# 7  
Old 03-05-2008
Quote:
Originally Posted by senthil_is
Hi,

Anybody help on this. Smilie

I want to merge the line with previous line, if the line starts with 7.
Otherwise No change in the line.

Example file aa.txt is like below

122122
222222
333333
734834
702923
389898
790909
712345
999999

My output should be written in another file called bb.txt

122122
222222
333333734834702923
389898790909712345
999999

Your help is very much appriciated.
Code:
[n]awk '{
      if ($0 ~ /^7/)
         l = l" "$0
      else {
         if (l) print l
         l = $0
      }
} END {if (l) print l}' aa.txt > bb.txt

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