Exec: The execution of binaries is allowed on this file system.Noauto: The file system is only mounted when you enter the mount -a command.Auto: The file system will be mounted at boot time, automatically.Here are some of the more common options: The man page for each file system will list the options that can be used. The "options" field options must be in a comma-separated list with no spaces between them. Finding the values for these fields can be daunting, particularly the values for the "options" field. These fields must be specified in this order, and they must have a space or a tab between them. If the flag is set to zero, it means "don't check at all." If your file system isn't a journaling file system (such as ext2 or FAT16/32, for example), it is best to turn this off by setting it to 0. Your main boot and operating system partition should be 1, and the rest can be set to 2. It tells Linux which partitions should be checked for errors using fsck, and in which order. Dump: A reference to an all-but obsolete means of backing up file systems, where the entire file system was "dumped" to tape.Options: Each file system can have options specified to turn on or off functionality.Type: The type of file system on the partition.Mount point: The location in the filesystem at which you wish to have the partition mounted.This is the identifier for the partition that should be mounted. File system: Not, as its name would suggest, the type of file system on the partition (that's what the type field is for).Each entry is made up of six fields. The fields are: The fstab file contains an entry for each file system that is mounted when your computer is restarted. If this is blank, the device is not mounted. Mountpoint: This shows the point in the file system at which this device is mounted.The "disk" entry means a disk drive, the "part" entry stands for partition, and "rom" means Read-Only Memory (CD-ROM). Type: This identifies the type of device.Ro: This column will show 1 for read-only devices and 0 for read-write devices.Size: This is the amount of data that can be stored in the device.Note that device sr0 has a value of 1, indicating it is removable. Rm: This column shows whether the device is removable or not.The minor number is a count of the number of devices of that type. ![]() The major number indicates the type of the device (or, more precisely, the type of driver used to talk to that device). Maj:Min: This column holds the major and minor numbers of the device.For example, "sdb2" would be partition 2 on the second SCSI hard drive. If there is a number appended, it indicates a partition. The letter identifies individual hard disks, with "a" being the first, "b". Devices names that start "sd" and are followed by a letter represent SCSI hard disks. We want the "others" to have read and permissions, so they need to be set to 4 (100). These users already have read and write permissions, which is 6 (110). We must set the user and group permissions as well, so we need to set them to what they are already. Let's add the read permission back on the ".page" files for the others category of users. Using 1 (001) would remove the read and write permissions and add the execute permission. So if read and write permissions were already in place you would have to use 7 (111) to add execute permissions. Using this method, you set the permissions that you wish to have you do not add these permissions to the existing permissions. 2, which is 010 in binary, would mean the write permission. ![]() So 5, which is 101 in binary, means read and execute. ![]() ![]() 7: (111) Read, write, and execute permissions.Įach of the three permissions is represented by one of the bits in the binary equivalent of the decimal number.3: (011) Write and execute permissions.
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