cmd:tune2fs

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Both ext2 and ext3 have the same magic number: 0xEF53

fdisk -l | grep -i 'Linux$' | fcol 1 - | xargsi sh -c "echo {}:; tune2fs -l {} | grep -E '^Filesystem.*(name|magic)'"

Filesystem features:      filetype sparse_super
Mount count:              0
Maximum mount count:      31

Filesystem features:      has_journal filetype needs_recovery sparse_super
Mount count:              18
Maximum mount count:      -1