Extracting specific block

Shell Programming and Scripting
1

Hi Everyone , have a great day

i have a file which has almost 20,000 blocks each starting with this particular line " rTCCreditControlRecord " , how can i bring out the 7172 block out of that file

Thanks in Anticipation

2

Try both the following commands.

3

Not working , meanwhile i have tried something like this

while IFS= read -r EachLine
do
   'echo $EachLine
   if $EachLine = 'rTCCreditControlRecord'; then
   count = count + 1
   fi
   if count = 7172; then
   echo $EachLine
   fi
done < CCN02

where CCN02 is input file but its not working either

4

if count = 7172; then
>>>that is a string comparison

if count -eq 7172; then
>>>that is a numeric comparison

I think you would want the numeric comparison.

5

-r: is not an identifier

#!/bin/sh
while IFS= read -r EachLine
do
   #echo $EachLine
   if $EachLine = 'rTCCreditControlRecord'; then
   count = count + 1
   fi
   if count -eq 7172; then 
   echo $EachLine
   fi
done < CCN02

Not Working :frowning:

6

Add a display to echo to the screen what is happening. Could be count problem, $EachLine problem, file problem, etc...
By the way, wouldn't $EachLine be equal to the full line? rTCCreditControlRecord abcdefg 12345?

#!/bin/sh
while IFS= read -r EachLine
do
   #echo $EachLine
   if $EachLine = 'rTCCreditControlRecord'; then
   count = count + 1
   fi
   echo $count $EachLine   #for debug purposes
   if count -eq 7172; then 
   echo $EachLine
   fi
done < CCN02
7 
[ ~/tmp/tccredit ] > cat CCN02
rTCCreditControlRecord abc 001
rTCCreditControlRecord abc 002
rTCCreditControlRecord abc 003
rTCCreditControlRecord abc 004
rTCCreditControlRecord abc 005
rTCCreditControlRecord abc 006
rTCCreditControlRecord abc 007
rTCCreditControlRecord abc 008

[ ~/tmp/tccredit ] > cat cntpr
#!/bin/bash
count=0
while read EachLine
   do
   prefix=$(echo $EachLine | cut -c1-22)
   if [ "$prefix" = "rTCCreditControlRecord" ] 
      then
      count=$(($count + 1))             
      fi
   echo "debug=" $count $EachLine   #for debug purposes
   if [ $count -eq 5 ]
      then 
      echo $EachLine
      fi
done < CCN02

provides as output===>

[ ~/tmp/tccredit ] > cntpr
debug= 1 rTCCreditControlRecord abc 001
debug= 2 rTCCreditControlRecord abc 002
debug= 3 rTCCreditControlRecord abc 003
debug= 4 rTCCreditControlRecord abc 004
debug= 5 rTCCreditControlRecord abc 005
rTCCreditControlRecord abc 005
debug= 6 rTCCreditControlRecord abc 006
debug= 7 rTCCreditControlRecord abc 007
debug= 8 rTCCreditControlRecord abc 008

Note that the 5th record is what I was looking for in the process. Comment out my #debug purposes line to only get the 5th record.

8

I have something else. But I'm not sure of performance.
The following gives the 10th line of record containing "rTCCreditControlRecord" in the file