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Search from one file and print the next line

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# 1  
Old 02-28-2012
Search from one file and print the next line
Hi,

I have a file that contain more than a 1000 entries like this in one file
Code:
P400000278
P400000446
P400000659
P400000789

I want to search in file that looks like this
Code:
>P400000278 Adenosine 3'-phospho 5'-phosphosulfate transporter
MVNPWKDYVKLSTVLMGSHGLTKGSLAFLNYPAQIMFKSAKVLPVMVMGAFVPGL
>P400000789 Vacuolar iron family transporter
MAETNSNGGFRAPLLRSLDGELEKGKGKNGRPKEPWKGEVVKSIVYAGLDAIVT
>P400000005 Vacuolar iron family transporter
MAETNSNGGFRAPLLRSLDGELEKGKGKNGRPKEPWKGEVVKSIVYAGLDAIVTSFSLII

I want output as following
Code:
>P400000278 Adenosine 3'-phospho 5'-phosphosulfate transporter
MVNPWKDYVKLSTVLMGSHGLTKGSLAFLNYPAQIMFKSAKVLPVMVMGAFV
>P400000789 Vacuolar iron family transporter
MAETNSNGGFRAPLLRSLDGELEKGKGKNGRPKEPWKGEVVKSIVYAGLDAIVT


Meaning that I want to print the next line as well as the line matching the pattern.

Can anyone help me with this?
Thanks in advance

Ashfaq
Last edited by Franklin52; 02-28-2012 at 09:10 AM.. Reason: Please use code tags for code and data samples, thank you
# 2  
Old 02-28-2012
Code:
grep -A1 -f file_containing_pattern file_to_be_searched

This User Gave Thanks to balajesuri For This Post:
Feeqa
# 3  
Old 02-28-2012
Thank you very much, it worked.
How can I count how many patterns matched?
# 4  
Old 02-28-2012
Code:
grep -c -f file_containing_pattern file_to_be_searched

This User Gave Thanks to balajesuri For This Post:
Feeqa
# 5  
Old 02-28-2012
Quote:
Code:
grep -A1 -f file_containing_pattern file_to_be_searched

Only GNU version of grep supports the -A option.

You can do something like that :
Code:
awk '
    NR==FNR { pattern[">" $1] ; next }
    $1 in pattern { print; print_next=1; next }
    print_next-- > 0
' file_containing_pattern file_to_be_searched

Jean-Pierre.
This User Gave Thanks to aigles For This Post:
Feeqa
# 6  
Old 02-28-2012
if f1 is the name of the file containing the pattern
and f2 is the file containing the data :

Code:
awk 'NR==FNR{a[$0];next}($1 in a){printf ">" $0}' f1 RS='>' f2

This User Gave Thanks to ctsgnb For This Post:
Feeqa
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