Linux Fsck Command Examples to Check and Repair Filesystem. Linux fsck utility is used to check and repair Linux filesystems ext. Depending on when was the last time a file system was checked, the system runs the fsck during boot time to check whether the filesystem is in consistent state. Becoming a Senior happens just once. Its the culmination of 13 years of education and should be celebrated to the fullest extent. I am so lucky to not only help you. System administrator could also run it manually when there is a problem with the filesystems. Make sure to execute the fsck on an unmounted file systems to avoid any data corruption issues. This article explains 1. Filesystem Check on a Disk Partition. First, view all the available partitions on your system using parted command as shown below. Number Start End Size Type File system Flags. B 1. 06. MB 1. 05. MB primary fat. 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Filesystem errors left uncorrected. Operational error. Usage or syntax error. Fsck canceled by user request. Shared library error. SteelWorx.png' alt='X Force 2012 Keygen' title='X Force 2012 Keygen' />Fsck Command Specific to a Filesystem Typefsck internally uses the respective filesystem checker command for a filesystem check operation. These fsck checker commands are typically located under sbin. The following example show the various possible fsck checker commands for example fsck. X Force 2012 Keygen' title='X Force 2012 Keygen' />For example, if you execute fsck over a ntfs partition, youll get the following error message. There is no fsck. So, this gives the following error message. Check All Filesystems in One Run using Option AYou can check all the filesystems in a single run of fsck using this option. This checks the file system in the order given by the fspassno mentioned for each filesystem in etcfstab. Please note that the filesystem with a fspassno value of 0 are skipped, and greater than 0 are checked in the order. The etcfstab contains the entries as listed below, cat etcfstab. Here, the filesystem with the same fspassno are checked in parallel in your system. AIt is recommended that you exclude the root filesystem during this global check by adding R option as shown below. AR y. Nov 2. 01. 1. Oct 2. 01. 1, FAT3. LFN. devsda. 7 8 files, 5. Note Option y is explained in one of the examples below. Check Only a Specific Filesystem Type using Option t. Using fsck t option, you can specify the list of filesystem to be checked. When you are using with option A, the fsck will check only the filesystem mentioned with this option t. Note that fslist is a comma separated values. Now, pass ext. 2 as the fslist value to t option as shown below fsck AR t ext. Nov 2. 01. 1. devsda. In this example, devsda. Using the keyword no in front of filesystem, you can check all other filesystem types except a particular filesystem. In the following example, ext. AR t noext. 2 y. Oct 2. FAT3. LFN. devsda. Dont execute Fsck on Mounted Filesystem using Option MIt is a good idea to use this option as default with all your fsck operation. This prevents you from running fsck accidentally on a filesystem that is mounted. As shown above, devsda. If you try to execute fsck on this devsda. M option, fsck will simply exit with the exit code 0 as shown below. M devsda. Skip the Display Title using Option TUsing option T, you can skip the title get displayed in the beginning of fsck command output. TAR. Nov 2. 01. 1. Cannot continue, aborting. Oct 2. 01. 1, FAT3. LFN. devsda. 7 8 files, 5. Note that the title is something like fsck from util linux 2. Force a Filesystem Check Even if its Clean using Option f. By default fsck tries to skip the clean file system to do a quicker job. Nov 2. 01. 1. devsda. You can force it to check the file system using f as shown below. Nov 2. 01. 1. Pass 1 Checking inodes, blocks, and sizes. Pass 2 Checking directory structure. Pass 3 Checking directory connectivity. Pass 4 Checking reference counts. Pass 5 Checking group summary information. Attempt to Fix Detected Problems Automatically using Option y. In the following example, devsda. Inputoutput error. Aug 2. 1 2. 1 5. Aug 2. Aug 2. 1 2. 1 2. Aug 1. Sr S w. T 1. 6 root root 4. Hp Scanjet G3010 Driver For Win7 here. Aug 2. 1 2. 1 1. Movies. 2 Cakewalk Sonar X3 Producer. As seen above, the directory Movies and a file test attributes are invalid. In the following example, y will pass yes to all the questions to fix the detected corruption automatically. Nov 2. 01. 1. devsda. Pass 1 Checking inodes, blocks, and sizes. Inode 2. 06. 03. 53 is a unknown file type with mode 0. Pass 2 Checking directory structure. Entry test in 2 has deletedunused inode 4. Clear yes. Pass 3 Checking directory connectivity. Pass 4 Checking reference counts. Pass 5 Checking group summary information. FILE SYSTEM WAS MODIFIED. Avoid Repair, but Report Problems to Stdout using Option n. It is possible to print such detected problems into stdout without repairing the filesystem using fsck n option. First, you could noticesee the problem in partition devsda. Movies directory and fwh file doesnt have valid attribute details. Aug 1. 9 0. 0 2. Aug 2. Movies. x wx 1 root root 8. Aug 2. 1 2. 1 2. Aug 2. Aug 2. 1 2. 1 5. The above problem in the specific partition displayed in stdout without doing any fix on it as follows,The following fsck example displays the problem in the stdout without fixing it. Nov 2. 01. 1. devsda. Pass 1 Checking inodes, blocks, and sizes. Inode 2. 06. 03. 53 is a unknown file type with mode 0. Inode 2. 06. 03. 53, iblocks is 8, should be 0. Fix no. Pass 2 Checking directory structure. Inode 2. 06. 03. 53 Movies has invalid mode 0. Inode 4. 90. 57 fwh has invalid mode 0. Entry fwh in 2 has an incorrect filetype was 1, should be 0. Pass 3 Checking directory connectivity. Unconnected directory inode 6. Connect to lostfound Unconnected directory inode 2. Connect to lostfoundPass 4 Checking reference counts. Inode 2 ref count is 4, should be 3. Fix no. Inode 6. Fix no. Inode 2. Fix no. Unattached inode 2. Connect to lostfound Pass 5 Checking group summary information. Block bitmap differences 1. Directories count wrong for group 1. WARNING Filesystem still has errors. Automatically Repair the Damaged Portions using Option a. In order to repair the damaged portion automatically without any user interaction, use the option a as shown below. ARThe option a is same as p in e. It cause e. 2fsck to fix any detected problems that has to be safely fixed without user interaction. In case when fsck requires administrators attention, it simply exits with error code 4 before printing the description of the problem. Inode 2. 06. 03. 53 is a unknown file type with mode 0. UNEXPECTED INCONSISTENCY RUN fsck MANUALLY. As you remember, fsck y option can be used here to fix the above issue automatically. Nov 2. 01. 1. devsda. Pass 1 Checking inodes, blocks, and sizes. Inode 2. 06. 03. 53 is a unknown file type with mode 0.