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In Linux, e2fsck is a disk maintenance command, used to check whether the partition using the ext2 file system is working properly. It can check the ext2, ext3, and ext4 file systems. The syntax is "e2fsck [parameter]". The e2fsck command is applicable to: RedHat, RHEL, Ubuntu, CentOS, SUSE, openSUSE, Fedora.
#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.
The e2fsck command is a disk maintenance command under Linux. It mainly has one function, that is, it can be used to check whether the partition using the Linux ext2 file system is working normally.
The e2fsck command can check the ext2, ext3, and ext4 file systems. If the system has been mounted, it is not recommended to check because it is unsafe. Applicable scope of this command: RedHat, RHEL, Ubuntu, CentOS, SUSE, openSUSE, Fedora.
Grammar format:
e2fsck [参数]
Common parameters:
| device | Prepared for inspection Hard disk partition, for example: /dev/sda1 |
| -b | Set the location where superblock is stored |
| -B | Set the size of the unit block |
| -c | Check whether the partition has bad sectors |
| -C file | Save the check results to file for viewing |
| -d | Print the debug results of e2fsck |
| -f | Forced check |
| -F | Before starting the check, clear the buffer cache of the device to avoid errors |
| -l bad_blocks_file | Add the block data with bad blocks to bad_blocks_file |
| -L bad_blocks_file | Set the block data of bad blocks to be saved in bad_blocks_file. If there is no such file, it will be automatically generated. |
| -n | Open the file system in [read-only] mode |
| -p | Check the partition and automatically fix it if there is any problem |
| -v | Detailed display mode |
| -V | Displays the current e2fsck version |
| -y | Previous Set all check questions to answer [Yes] |
Reference example
Check whether /dev/hda5 is normal, if If there is an exception, it will be automatically repaired, and if there are questions and answers about the setting, the answer is [Yes]:
e2fsck -a -y /dev/sda1
Please umount the partition before executing e2fsck or fsck, otherwise the file system may be damaged. If you need to check and repair the root directory/, you need to enter the singal user mode to execute.
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