Need command for grepping pattern lines with subsequent lines


 
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# 1  
Old 03-04-2013
Need command for grepping pattern lines with subsequent lines

Hi,

I have a requirement like, I have a list of pattens in a file say pattern.txt,

Code:
PHC111
PHC113

and in another file called master.lst i have entries like,

Code:
PHC111
a
b
PHC112
a
PHC113
b
c
PHC114
d
e
PHC115

now i want to use the pattern.txt file as patterns and grep the lines in master.lst so that i will get output like,
Code:
PHC111
a
b
PHC113
b
c

Please suggest the suitable command. Thanks.

Last edited by radoulov; 03-06-2013 at 10:07 AM.. Reason: Code tags!
# 2  
Old 03-04-2013
What have you tried?
# 3  
Old 03-06-2013
Do the PHC lines ALWAYS start with "PHC"?
It helps to exactly describe the problem.
# 4  
Old 03-06-2013
Also, what's your OS? (more specifically, do you have GNU grep?)
# 5  
Old 03-06-2013
you can use this code if your PHC line always starts with "PHC"

here pattern.txt contain your pattern list
and mint.txt contains your data

Code:
while read pat
do
count=2
while read line
do
b=`echo $line|grep PHC`
if [ $? -eq 0 ]
then
if [ $count -eq 1 ]
then
break;
break;
fi
a=`echo $line|grep $pat`
if [ $? -eq 0 ]
then
count=`echo "$count-1"|bc`
fi
fi
if [ $count -eq 1 ]
then
echo $line
fi
done<mint.txt
done<pattern.txt

# 6  
Old 03-06-2013
Using while loop:

Code:
while read line;do egrep -A2 $line file2;done < file1

PHC111
a
b
PHC113
b
c

Using awk:

Code:
awk 'FNR==NR {a[$1];next} $1 in a {print;getline;print;getline;print}' file1 file2

PHC111
a
b
PHC113
b
c

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