Bulk rename .jpeg to .jpg

1. Open the terminal.

2. Change directory to the parent directory of folder1 using the cd command.

   cd /path/to/parent/directory/of/folder1/
   

3. Run this command to rename all files with .jpeg extension to .jpg.

   find . -type f -name '*.jpeg' -print0 | xargs -0 rename 's/\.jpeg/\.jpg/'
   

The above command uses the Perl rename program which is installed by default in Debian-based operating systems. In some other Linux distributions, the same Perl rename program is called prename. prename can be installed by following the instructions from: Get the Perl rename utility instead of the built-in rename.