Remount filesystem read-write linux
Remount the root filesystem as read-write (e.g. after rescue boot)
mount -o remount,rw /
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Check filesystem integrity
fsck -n /dev/sdb1
Create ext4 filesystem
mkfs.ext4 -L datalabel /dev/sdb1
Resize ext4 filesystem
resize2fs /dev/sdb1
Show filesystem info
tune2fs -l /dev/sda1 | grep -E 'Block (count|size)|Mount count|Last mount'
Disk usage with depth
du -h --max-depth=2 /var | sort -rh | head -20