Shell Programming and Scripting

I also feel weird about it
Really thanks for your help and patience and explanation all the time, ahmad ^^

Hi Patrick, do these commands fail too?

Code:

sed -n '/>seq_8$/,$p' infile

Code:

awk '/>seq_8$/,0' infile

Thanks a lot, ahmad and sorry for disturbing you
You're right. All of your command or code work perfectly for my test sequence.
I just found out that I did a careless mistakes when run the code that you suggested
Really thanks a lot for your help.
My problem is solved finally ^^

---------- Post updated at 08:23 PM ---------- Previous update was at 08:21 PM ----------

Hi Scrutinizer,
Thanks a lot for your suggestion code ^^
Both of your code and ahmad suggested's code work perfectly for my test sequence.
Sorry that my careless mistakes create trouble for you all

---------- Post updated at 09:53 PM ---------- Previous update was at 08:23 PM ----------

Hi, I just found out that both of your suggested code, will print out all those sequence after seq_8 as well
Do you got better idea, just let it extract only seq_8 ?
Really thanks for your help ^^

---------- Post updated at 09:58 PM ---------- Previous update was at 09:53 PM ----------

Hi Ahmad,
the same problem as Scrutinizer's code, happen to your suggested code as well
It will extract all those sequence content after seq_8 as well

Well that is what you asked for:
Or is that not what you mean? Can you give a better sample input and output:

Oic.
Sorry for let you misunderstanding my question.
I apologize and sorry for it
My thread one's problem already solved by ahmad ^^
Regarding to thread number 5,
Actually I just asking about how to extract only those content that matched with seq_8.
At this time, input :
>seq_1
DSASSTRRARRRRTPRTPSLRSRRSDVTCS
>seq_3
RMRLRRWRKSCSERS*RRSN
>seq_8
RTTGLSERPRLPTTASRSISSRWTR
>seq_10
NELPLEKGSLDSISIE
>seq_9
PNQGDAREPQAHLPRRQGPRDRPLQAYA+
QVQHRRHDHSRTQH*LCRRRQREDCDRLHR
>seq_4
DRGKGQAGCRRPQEGEALVRRCS>seq_6
FA*GLAAQDGEA*SGRG

My output: Extract only the data of seq_8:
>seq_8
RTTGLSERPRLPTTASRSISSRWTR

Sorry again, Scrutinizer.
I will notice my mistakes in future.
Hope for your understanding.
sorry

Code:

awk '$1~/>/{f=0}/>seq_8$/{f=1}f' file

Too many examples, too many solutions.
You should start solving your own problems

Thanks a lot and a lot, danmero.
This times your code run perfectly and solved my trouble that make me confusing this few days ^^
I believe the reason that I keep on got different output result maybe due to the different version of awk and sed that I used at two different computer server.
hehe.
I do this careless and stupid mistakes
And guilty to let you all busy to help me solve it .
I really appreciate all of your help ^^