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delete just the line above

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# 1  
Old 11-25-2011
delete just the line above
Hey guys,

I want to delete all of the lines that are before pattern1 and used this command

Code:
sed '/pattern1/,1d;p'

but it is very strange and doing some duplicate line, I've googled and other commands are not working, do you have any idea about that?
# 2  
Old 11-25-2011
Hi Johanni,

Try:
Code:
$ sed -n '/pattern/,$ p' infile

Regards,
Birei
This User Gave Thanks to birei For This Post:
Johanni
# 3  
Old 11-25-2011
not working Smilie
# 4  
Old 11-25-2011
Paste part of your input file and your sed command. It will be helpful to see the reason.

Regards,
Birei
# 5  
Old 11-25-2011
Code:
 sed '1{h;d}; /pattern/{x;d}; /pattern/!{x} ; $x' inputfile

EDIT: oops, i misread. I thought you wanted to delete only one line before pattern

Here:
Code:
sed '1,/pattern/d' inputfile

will delete all lines up to pattern. But bireis solution works also. If it is not working, your regex pattern may be wrong.
# 6  
Old 11-25-2011
input
Code:
   RDS radio  
feature
   Yes  
   Visual Radio  
feature
   No  
   Supported audio formats  
feature
   spEC  spEC  espEC  spEC  spEC  spEC  
   Supported image files  
feature
   spEC  
   Supported video files  
feature
   spEC  spEC  spEC  spEC  spEC  computer
   Design  
   Colour  
feature
   spEC  spEC  spEC  spEC design

I want to delete the lines above the lines that have "spEC", so the desired output is:
Code:
   RDS radio  
feature
   Yes  
   Visual Radio  
feature
   No  
   Supported audio formats  

   spEC  spEC  espEC  spEC  spEC  spEC  
   Supported image files  

   spEC  
   Supported video files  

   spEC  spEC  spEC  spEC  spEC  computer
   Design  
   Colour  

   spEC  spEC  spEC  spEC design

or either:
Code:
   RDS radio  
feature
   Yes  
   Visual Radio  
feature
   No  
   Supported audio formats  
   spEC  spEC  espEC  spEC  spEC  spEC  
   Supported image files  
   spEC  
   Supported video files  
   spEC  spEC  spEC  spEC  spEC  computer
   Design  
   Colour  
   spEC  spEC  spEC  spEC design

# 7  
Old 11-25-2011
I missunderstood your first question. Try:
Code:
$ cat infile 
   RDS radio  
feature
   Yes  
   Visual Radio  
feature
   No  
   Supported audio formats  
feature
   spEC  spEC  espEC  spEC  spEC  spEC  
   Supported image files  
feature
   spEC  
   Supported video files  
feature
   spEC  spEC  spEC  spEC  spEC  computer
   Design  
   Colour  
feature
   spEC  spEC  spEC  spEC design
$ sed -ne '$ { p; q }; $! N; /\n.*spec.*$/I D; P; D' infile  
   RDS radio  
feature
   Yes  
   Visual Radio  
feature
   No  
   Supported audio formats  
   spEC  spEC  espEC  spEC  spEC  spEC  
   Supported image files  
   spEC  
   Supported video files  
   spEC  spEC  spEC  spEC  spEC  computer
   Design  
   Colour  
   spEC  spEC  spEC  spEC design

Regards,
Birei
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