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Join lines using sed or awk

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# 1  
Old 10-17-2016
Join lines using sed or awk
Hi,

I have text file that looks like this:

Code:
blabla
bla
PATTERN
LINE1
LINE2
bla
bla
bla
PATTERN
LINE1
LINE2
bla
PATTERN
LINE1
LINE2
bla
bla
...



There are exactly 2 lines following PATTERN.
I need output to be one line with PATTERN, LINE1 and LINE2 concatenated.
That is, output from input file above should be :

Code:
PATTERNLINE1LINE2
PATTERNLINE1LINE2
PATTERNLINE1LINE2

How can such 3 linies be joined using sed or awk ?

Regards,
Hench
Last edited by Scrutinizer; 10-17-2016 at 03:31 PM.. Reason: code tags
# 2  
Old 10-17-2016
Hi,
Don't believe to use code tag button for code or data samples.
Either, you can try this:
Code:
sed -ne '/PATTERN/{N;N;s/\
//g;p;}' file

Regards.
Last edited by disedorgue; 10-17-2016 at 03:39 PM.. Reason: Add -n flag to sed command
# 3  
Old 10-17-2016
Hello Hench,

Please use code tags for commands/codes/Inputs into your posts as per forum rules, could you please try following and let me know if this helps.
Code:
awk '/PATTERN/ && A{print A;A=""} /PATTERN/ || /LINE1/ || /LINE2/{A=A?A $0:$0}'  Input_file

Output will be as follows.
Code:
PATTERNLINE1LINE2
PATTERNLINE1LINE2

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
hench
# 4  
Old 10-17-2016
Hi, try:
Code:
sed -n '/PATTERN/{N;N;s/\n//gp;}' file

# 5  
Old 10-17-2016
Maybe this awk, though I am still learning so may not be the best Smilie.

Code:
awk '/PATTERN/{if (x)print x;x="";}{x=(!x)?$0:x$0;}END{print x;}' file

output:
Code:
PATTERNLINE1LINE2
PATTERNLINE1LINE2
PATTERNLINE1LINE2

As @RavinderSingh13 found my script is not desired and also carries over the bla. Sorry for thatSmilie
Last edited by cmccabe; 10-17-2016 at 04:18 PM..
# 6  
Old 10-17-2016
IMO, above sed solutions will give wrong results if input has LINE3 in place of LINE1 or LINE2 for example.

Below one should work for given input patterns:
Code:
sed -ne '/PATTERN/ {N;/LINE1/N;/LINE2/s/\n//gp}' file

Last edited by greet_sed; 10-17-2016 at 03:52 PM.. Reason: Add text
# 7  
Old 10-17-2016
Quote:
Originally Posted by cmccabe
Maybe this awk, though I am still learning so may not be the best Smilie.
Code:
awk '/PATTERN/{if (x)print x;x="";}{x=(!x)?$0:x$0;}END{print x;}' file

output:
Code:
PATTERNLINE1LINE2
PATTERNLINE1LINE2
PATTERNLINE1LINE2

Hello cmccabe,

IMHO above code will not produce output as per OP's request. It will give blaalso in output.

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
cmccabe
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