count and compare no of records in bash shell script.

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# 1  
Old 02-24-2010
count and compare no of records in bash shell script.

consider this as a csv file.


i want to read the csv file and count the number of rows that start with D and compare with the value(next value to T) row starts with T.

please provide me the unix shell script code.
# 2  
Old 02-24-2010
there is only one T in whole file and number of rows having D. When you say compare ... what do you need ?
D having maximum rows and if it is greater than number in T ?

Check this post

Are you trying something similar ?
# 3  
Old 02-24-2010
awk -F "," '$1 == "D"{cnt+=1};$1 == "T"{tot=$2}END{print "Total in T is:",tot;if(cnt = tot) print "Same count and Count number is:",cnt; else print "Total not equal",tot}' file

Devaraj Takhellambam
# 4  
Old 02-24-2010
shell script

I wrote the following script with my understanding to your question. Just try it.
You didn't tell what we need to do after match the T value with no of rows starting with "D".
So just I print one statement after match the value.

while read line; do 
  if `echo ${line} | grep "^D" 1>/dev/null 2>&1` 
     counter=`expr $counter + 1` 
    `echo ${line} | grep "^T" 1>/dev/null 2>&1` 
    Tval=`echo ${line} | cut -d "," -f 2` 
done < csvfile  
if [ $Tval -eq $counter ] 
  echo "No of rows matched with T Value" 
  echo "Not matched" 

Last edited by Franklin52; 02-24-2010 at 09:44 AM.. Reason: Please indent your code and use code tags!
# 5  
Old 02-24-2010
Hope this works as you expect

no_D=`grep "^D" inp.txt | wc -l`
no_T=`grep "^T" inp.txt | wc -l`

if [ $no_D -gt $no_T ]
echo "More rows with D"
echo "More rows with T"

You can add your logic in if else block.
# 6  
Old 02-24-2010
cut command for bash shell

Hi Nila

in am working in bash shell script.
the cut command is not working.

Tval=`echo ${line} | cut -d "," -f 2`

the csv file we using delimeter # so replaced the delimeter in the cut command with # and executed.

it giving error.
# 7  
Old 02-24-2010
It giving what error?
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