Q:

adb pull multiple files with the same extension

How can we pull multiple files with the same extension by using "abd" command? 
More details, I know that we can use command 
adb pull sdcard/folder target-folder

to get all file of the folder. 
I use this command to filter file in the adb shell.
ls -lR sdcard/folder | grep "ext"

But I want to filter some files with the same extension and pull them. 
So now, how can we combine two commands?

A:

adb shell ls sdcard/folder/*.ext | tr '\r' ' ' | xargs -n1 adb pull

See adb pull multiple files

