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Greping next line after grep match


 
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# 1  
MySQL Greping next line after grep match

Hi All
I have a file with tha same line multiple times and its easy to grep out those lines using
Code:
grep "pattern" file

although I need to know exactly what the next line after those lines are
Can anyone please shed some light on this on how i can simultaneously grep the pattern and the next line which follows the pattern matching line?
Cheers Smilie
# 2  
Try:
Code:
grep -A1 "pattern" file

This User Gave Thanks to bartus11 For This Post:
# 3  
Bartus ... I cant stop saying thanks to you ... thats exactly what I wanted ... and I hv more questions coming on this thread ... the other one is rightfully closed ...was getting too long Smilie
Hv a great day !!
# 4  
of if your grep version doesn't support -A:

Code:
#  awk '/match this/ { print;getline;print}' infile
match this pattern
and print next line

HTH
This User Gave Thanks to Tytalus For This Post:
# 5  
Both of them worked and produced desirable results
Cheers Smilie

---------- Post updated at 08:06 AM ---------- Previous update was at 05:50 AM ----------

@Bartus
Hi Bartus I noticed that the code you provided here https://www.unix.com/302510509-post113.html is giving me unexpected result for the following sample file:
Code:
SK1.scplasm1
Code:
5057-5146
Ref:
AGAAATGCAACGCGAGAGCGCTATTTTACCAACGAAGAATCTGTGCTTCATTTTTGTAAAACAAAAATGCAACGCGAGAGCGCTAATTTT

Gen:
AGAAATGCAACGCGAGAGCGCTATTTTACCAACGAAGAATCTGTGCTTCATTTTTGTAAAACAAAAATGCAANNCGAGAGCGCTNNTTTT

SK1.scplasm1
2903-2922
Ref:
CCTTGAACTTGCATCTAAAC

Gen:
CCTTGAACTTGCATCTAAAC
I get result
Code:
5056 N's and then AGAAATGCAACGCGAGAGCGCTATTTTACCAACGAAGAATCTGTGCTTCATTTTTGTAAAACAAAAATGCAANNCGAGAGCGCTNNTTTT(which is Gen:5057-5146) and nothing else
However my expected output is
Code:
2092 N's (to fill gap from 1-2092) then CCTTGAACTTGCATCTAAAC(which is Gen:2903-2922) then 2135 N's to fill the gap from 2923-5056 then AGAAATGCAACGCGAGAGCGCTATTTTACCAACGAAGAATCTGTGCTTCATTTTTGTAAAACAAAAATGCAACGCGAGAGCGCTAATTTT (which is Gen:5057-5146)
and so on with the rest of the file. Can you help me figure out whats not working in the code or how it can be changed? Cheers and thanks in advance:) Good day!! ---------- Post updated at 08:14 AM ---------- Previous update was at 08:06 AM ---------- Correction However my expected output is Code: 2902 N's (to fill gap from 1-2902) then CCTTGAACTTGCATCTAAAC(which is Gen:2903-2922) then 2135 N's to fill the gap from 2923-5056 then AGAAATGCAACGCGAGAGCGCTATTTTACCAACGAAGAATCTGTGCTTCATTTTTGTAAAACAAAAATGCAACGCGAGAGCGCTAATTTT (which is Gen:5057-5146)

# 6  
Try this:
Code:
#!/usr/bin/perl
open I, "$ARGV[0]";
local $/;
$_=<I>;
while (/(.*)\n(\d+)-(\d+)\nRef:\n.*\n\nGen:\n(.*)/g){
  $h{$1}{"$2-$3"}=$4;
}
for $i (keys %h){
  @arr=sort {(split /-/,$a)[0]<=>(split /-/,$b)[0]} (keys %{$h{$i}});
  $x=1;
  for $j (@arr){
    $j=~/(\d+)-(\d+)/;
    $s{$i}.="N" x ($1-$x) . $h{$i}{$j};
    $x=$2+1;
  }
}
for $i (keys %s){
  print "$i\n";
  print "$s{$i}\n";
}

This User Gave Thanks to bartus11 For This Post:
# 7  
Thanks Bartus .... that did the job as expected.
Could you please comment on the while loop especially the use of sort and split on @arr and of hashes %h and %s ... I will appreciate its need to understand the working of the code.
Cheers and have a nice daySmilie
 

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