Question

I have sth like this :

 mysql  --user=$db_user --password=$db_pwd -e"$expQ" | while read name; do
   if [ $name != 'name' ];then
     COUNTER=$(($COUNTER + 1))
   fi
 done

I want to update global counter , but when I executed next query the COUNTER does not pick the previous value bcz of the “|” (pipe) .

How I can change the above code to work with named pipes or any other alternative .
Here is reference but I am new to bash and unable to understand if that is possible with mysql
My bash version says:

GNU bash, version 3.2.48(1)-release (x86_64-apple-darwin10.0)
Copyright (C) 2007 Free Software Foundation, Inc.


Answer 1

Use Process Substitution instead, as shown below:

COUNTER=0
while read -r name 
do
   if [[ $name != "name" ]]
   then
     ((COUNTER++))
   fi
done < <(mysql  --user="$db_user" --password="$db_pwd" -e"$expQ")