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Grep lines between two specific words after matching pattern


 
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# 8  
Old 02-20-2020
If it's not a big file, you can get a simple to understand but clunky way by using the output of grep -n "start" $filename and grep -n "end" $filename to get you the record numbers to search between and then perhaps a sed -n "$start_line,$end_line"p $filename

This would be slow with a very large file though because you would read it all three times.

Does this help, or is your file big enough to warrant a solution that just reads it once?





Kind regards,
Robin
# 9  
Old 02-20-2020
Do you want the End pattern excluded? Try



Code:
awk '/Start/,/End/ {if (/12345/) P = 1; if (/End/) P = 0} P' file
12345
.
.

EDIT: included?

Code:
awk '/Start/,/End/ {if (/12345/) P = 1; if (P) print; if (/End/) P = 0}' file
12345
.
.
End

If there are more pattern pairs found in the file (which is not specified nor found in sample input) we need to rethink.

Last edited by RudiC; 02-20-2020 at 06:44 AM..
# 10  
Old 02-20-2020
Dear rbatte1,





Dear RudiC,

As per your suggestion, i have tried the solution on sample file and output is like this

Code:
grep -n "start" $filename

Quote:
output:
12:start
41:start
Code:
grep -n "stop" $filename

Quote:
output:
28:end
49:end
there will be multiple matching patterns, hence need to grep with 3 matching pattern
# 11  
Old 02-20-2020
Code:
grep -zoP "(?s)Start.*12345.*End" file


Last edited by rdrtx1; 02-20-2020 at 12:44 PM..
# 12  
Old 02-20-2020
Code:
awk '/Start/{p=$0; next} p{p=p ORS $0} /End/{if(p~/12345/)print p; p=x}' file

Or, using vertical real estate:
Code:
awk '
  /Start/ {
    buffer=$0
    next
  } 
  buffer {
    buffer=buffer ORS $0
  } 
  /End/ {
    if(buffer~/12345/) print buffer
    buffer=""
  }
' file

# 13  
Old 02-21-2020
The previous did not work for me.
Perhaps because of the mistake that a test buffer makes assumptions about the contents that can go wrong.
Better have a separate state variable (here: buffer_on)
Code:
awk '
  buffer_on {
    buffer=buffer ORS $0
  }
  ! buffer_on && /Start/ {
    buffer_on=1
    buffer=$0
  }
  buffer_on && /End/ {
    if (buffer~/12345/) print buffer
    buffer_on=0
  }
' file

--- Post updated at 12:07 ---

Introducing a separator variable:
one can include/exclude the Start and/or End pattern by simply changing the order of the 3 code blocks.
Code:
awk '
  buffer_on {
    buffer=buffer ors $0
    ors=ORS
  }
  ! buffer_on && /Start/ {
    buffer_on=1
    buffer=ors=""
  }
  buffer_on && /End/ {
    if (buffer~/12345/) print buffer
    buffer_on=0
  }
' file

Code:
awk '
  ! buffer_on && /Start/ {
    buffer_on=1
    buffer=ors=""
  }
  buffer_on {
    buffer=buffer ors $0
    ors=ORS
  }
  buffer_on && /End/ {
    if (buffer~/12345/) print buffer
    buffer_on=0
  }
' file

Code:
awk '
  ! buffer_on && /Start/ {
    buffer_on=1
    buffer=ors=""
  }
   buffer_on && /End/ {
    if (buffer~/12345/) print buffer
    buffer_on=0
  }
  buffer_on {
    buffer=buffer ors $0
    ors=ORS
  }
' file

Code:
awk '
   buffer_on && /End/ {
    if (buffer~/12345/) print buffer
    buffer_on=0
  }
  buffer_on {
    buffer=buffer ors $0
    ors=ORS
  }
  ! buffer_on && /Start/ {
    buffer_on=1
    buffer=ors=""
  }
' file

# 14  
Old 02-22-2020
Dear Scrutinizer and MadeInGermany ,

both solutions are working fine for thank you so much.





Thanks rbatte1,

I have tried your approach also, it works fine, but issue is that sed -n "$start_line,$end_line"p $filename is not working
calling variable inside sed is not working, sed -n "3,15"p $filename is working fine but sed -n "$start_line,$end_line"p is not, is there any alternate solution.
As per your suggestion i have tried this

Code:

# input of sample.gmf is like this, without quotes, "DOCSTART_2 |" for start
  #input of sample.gmf is like this, without quotes,"DOCEND |" for end 

# input for third matching pattern is "343"

 
# after grep -n the output is like this "1:DOCSTART_2 |" or "520:DOCEND |"


grep -n "DOCSTART_2" /home/testing/sagar/sample.GMF | awk -F ":" '{print $1}'  >  cat /home/testing/sagar/DOCSTART_2    ## start line numbers for entire file 

grep -n "DOCEND" /home/testing/sagar/sample.GMF | awk -F ":" '{print $1}'  >  cat /home/testing/sagar/DOCEND   ## end line numbers for entire file

input=`grep -n "12345" /home/testing/sagar/sample.GMF | awk -F ":" '{print $1}'`     # matching pattern (343)
  
> /home/clarity/sagar/less_DOCSTART_2
> /home/clarity/sagar/great_DOCEND

for file in `cat /home/testing/sagar/DOCSTART_2`
do
a=`echo $file`
if [ $a -lt $input ]
then
echo $a >> /home/clarity/sagar/less_DOCSTART_2
else
echo hi >> /dev/null
fi
done
 DOCSTART=`sort -n  /home/clarity/sagar/less_DOCSTART_2 | tail -1`  ## greatest start number


 for file1 in `cat /home/clarity/sagar/DOCEND`
do
b=`echo $file1 | awk -F ":" '{print $1}'`
if [ $b -gt $input ]
then
echo $a >> /home/clarity/sagar/great_DOCEND
else
echo hi >> /dev/null
fi
done
DOCEND=`sort -n  /home/clarity/sagar/great_DOCEND | head -1`   ## lowest end number
cat /home/testing/sagar/sample.GMF | sed -n "$DOCSTART,$DOCEND"'p  > /home/testing/sagar/sample.GMF_new   ##### not working

any suggestions or any changes in approach.
Thanks in advance.
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