Предотвратите использование Flash с помощью веб-камеры и микрофона?

Вот пример того, как цикл FOR может быть применен в сценарии bash для решения этой задачи:

#!/bin/bash

# Execute do-done inner part for each "item" under "folder/subjects/"
for subject in folder/subjects/*
do
    # Check whether the source file exists
    if [[ -f ${subject}/mri/norm.mgz ]]
    then
        # ${subject##*/} will cut the parent path from the value of the variable '$subject'
        echo "Processing: ${subject##*/}"

        # Create the new subject directory
        mkdir -p "folder/investigation_folder/fs_norms/${subject##*/}"

        # Copy the .mgz file into the new directory
        cp "${subject}/mri/norm.mgz" "folder/investigation_folder/fs_norms/${subject##*/}/"

        # Do the conversion to .nii (I'm not sure this is the correct syntax of mri_convert that you are using)
        mri_convert "folder/investigation_folder/fs_norms/${subject##*/}/norm.mgz" "folder/investigation_folder/fs_norms/${subject##*/}/norm.nii"
    fi
done