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How to negate pattern within sed?

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# 1  
Old 08-14-2013
How to negate pattern within sed?
Example:
I have data like,
Code:
H|1|2|#||4|4|5|6
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
T|g|g|G|G|g|g|
T|g|g|G|G|g|g|

I have to write command, it should delete all the lines except line starting with "D".

I have tried sed '/^\(D\)|/!d' filename. But its not working as expected.

Is there any other way of doing this?
Last edited by Franklin52; 08-14-2013 at 10:53 AM.. Reason: Please use code tags
# 2  
Old 08-14-2013
Code:
$ cat a.txt
H|1|2|#||4|4|5|6
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
T|g|g|G|G|g|g|
T|g|g|G|G|g|g|

$ sed '/^D/!d' a.txt
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|

# 3  
Old 08-14-2013
Code:
$
$ cat a.txt
H|1|2|#||4|4|5|6
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
T|g|g|G|G|g|g|
T|g|g|G|G|g|g|
$
$ sed '/^[^D]/d' a.txt
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
D|f|g|h|j|j|k|k|
$
$

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