Shell Programming and Scripting

I would like to know how to automate an already made shell script (all the steps of all the commands done on a specific folder) by utilizing a list (a .txt) of all folder names that the shell scripts goes and executes

For example:

In the working folder called main/ there are subfolders named folder1, folder2, folder3.....folder100 and shell script shell.sh.

vi shell.sh

Code:

perl automate.pl /home/main/folder1/test.txt > foldername_test.out
perl automate_second.pl foldername_test.out > foldername_test_1.out

This shell script has to be executed inside all the 100 folders
I would like to know how to automate this shell script may be by taking a list of the names of all the folders. Also the folder names doesn't follow any logic though the first 2 letters are same.

Please let me know how to do the automations

Is this what you're after:

Code:

while read foldername
do
   perl automate.pl /home/main/${foldername}/test.txt > ${foldername}_test.out
   perl automate_second.pl ${foldername}_test.out > ${foldername}_test_1.out
done < a.txt

do the 'read foldername' recognizes the actual foldenames? Because I have 100s of folders.

Yes, it is reading them from the a.txt, just put each foldername you need processed in a.txt - one foldername per line.