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Loop device

Steps

snippet.sh
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# create backing file
dd if=/dev/zero of=exp1.img bs=1MB count=16

# convert file to ext4-fs
mkfs.ext4 exp1.img

# create loop device
sudo losetup --find --show exp1.img

# create folder to mount loop-device
mkdir exp-fs

# mount loop-device on exp-fs
sudo mount /dev/loop<NUM> exp-fs

# list files
ls exp-fs

Refer