Counter in seperate text file

Question

I have a script that processes files based on drop folders, I created a function to do the processing and based on a set of variables I process a folder

funtion filedetect {
//
<some processing code code>
//
}

folder=1
source="/dir_1/"
reciep="me@mo.ma"
filedetect    

folder=2
source="/dir_2"
reciep="ma@me.mo"
filedetect

Now I would like to add a peace of code to create 1 text file with a counter that basically counts how many files are found and processed in each folder. That is why I added the variable 'folder' so that the text file contains something like:

FOLDER 1 = [count]
FOLDER 2 = [count]
etc.

But for that I need to read by line the previous 'count' and replace that with count=count+1

how do I read the correct line based on the text file.

Answer 1

Assuming you've started with something like this

folder1=10
folder2=4
folder3=7

You can write it out with a command such as this

set | grep -E '^folder[0-9]+=' > counter.txt

To read it back in again you can simply source the file

source counter.txt

If you have a shell that handles arrays (bash, zsh) you can index the set of folders to an arbitrarily large number

folder[1]=10
folder[2]=4
folder[3]=7

And write this one variable array out with

set | grep '^folder=' > counter.txt

Read it back in using source, as above.

For arrays you would reference them like this echo "${folder[1]}" or foreach f "${folder[@]}"; do ... done. Or even this if your index values are in strict ascending order from 1:

i=1
while [[ $i -le ${#folder[*]} ]]
do
    echo "$i => ${folder[$i]}"
    ((i++))
done