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Start splitting filesystem
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‎README.md

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@@ -56,14 +56,19 @@ Pagers:
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- [more](more.md)
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- [pg](pg.md)
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File and directories:
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Files, directories, partitions:
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- [badblocks](badblocks.md)
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- [blkid](blkid.md)
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- [cp](cp.sh)
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- [du](du.md)
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- [e2fsck](e2fsck.md)
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- [e2fsprogs](e2progs.md)
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- [fdupes](fdupes.md)
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- [find](find.md)
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- [locate](locate.md)
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- [ls](ls.md)
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- [lsblk](lsblk.md)
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- [Swap partition](swap-partition.md)
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- [tree](tree.md)
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‎badblocks.md

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# badblocks
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e2fsprogs package.
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Most useful invocation:
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badblocks -nvs /dev/sdb
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- `-n`: non-destructive read-write mode. The default is non-destructive read-only.
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- `-s`: show progress
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- `-v`: verbose information
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The output of `badblocks -v` can be used as the input of `e2fsck -l` to mark some blocks as bad and not use them.

‎blkid.md

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# blkid
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`util-linux` package.
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Get UUID, label and filesystem type for all partitions
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sudo blkid
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Sample output:
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/dev/sda2: LABEL="DATA" UUID="E4EEDB25EEDAEF34" TYPE="ntfs"
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/dev/sdb1: LABEL="ESP" UUID="9E91-F4F8" TYPE="vfat"
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/dev/sdb2: LABEL="DIAGS" UUID="ECC5-8CEC" TYPE="vfat"
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/dev/sdb4: LABEL="WINRETOOLS" UUID="0058C6EB58C6DE92" TYPE="ntfs"
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/dev/sdb5: LABEL="OS" UUID="4C38CCBD38CCA6F4" TYPE="ntfs"
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/dev/sdb6: LABEL="PBR Image" UUID="C2CE5FDBCE5FC677" TYPE="ntfs"
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/dev/sdb7: UUID="3fabbe75-0c62-4705-a3ad-4e87c5dcc143" TYPE="ext4"
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/dev/sdb8: UUID="56886cc6-e247-488a-9acf-a07a99cfa3ca" TYPE="ext4"
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/dev/sdb9: UUID="bbc2c9bf-4846-44d1-81c0-eade6d2dcefb" TYPE="swap"

‎e2fsck.md

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# e2fsck
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Black list bad blocks so that the OS will not use them:
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sudo badblocks -v /dev/sdb > /tmp/bad-blocks.txt
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sudo e2fsck -l /tmp/bad-blocks.txt /dev/sdb
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TODO: is black-listing a feature of ext filesystems?

‎e2fsprogs.md

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# e2fsprogs
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Library of ext filesystem utilities.
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<http://en.wikipedia.org/wiki/E2fsprogs>
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Contains:
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- `badblocks`
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- `blkid`
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- `e2fsck`
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Present by default on almost all Linux distributions.

‎eclipse.md

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- `Ctrl + Shift + R`: find files.
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- `Ctrl + Shift + G`: find where the id (class, method, etc.) under the cursor is used.
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- `Ctrl + O`: dropdown filter jump to method definition in current file
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Search entire

‎filesystem.md

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A SanDisk SD card had a device named `mmcblk0`.
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### lsblk
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List block devices, including those which are not mounted.
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sudo lsblk
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Sample output:
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NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
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sda 8:0 0 465.8G 0 disk
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|-sda1 8:1 0 1.5G 0 part
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|-sda2 8:2 0 93.2G 0 part /media/win7
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|-sda3 8:3 0 13.7G 0 part
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|-sda4 8:4 0 1K 0 part
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|-sda5 8:5 0 338.1G 0 part /
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|-sda6 8:6 0 3.7G 0 part [SWAP]
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`-sda7 8:7 0 15.6G 0 part
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sdb 8:16 0 931.5G 0 disk
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`-sdb1 8:17 0 931.5G 0 part /media/ciro/DC74FA7274FA4EB0
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`-f`: show mostly information on filesystems:
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sudo lsblk -f
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Sample output:
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NAME FSTYPE LABEL MOUNTPOINT
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sda
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|-sda1 ntfs SYSTEM_DRV
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|-sda2 ntfs Windows7_OS /media/win7
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|-sda3 ntfs Lenovo_Recovery
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|-sda4
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|-sda5 ext4 /
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|-sda6 swap [SWAP]
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`-sda7 ext4
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sdb
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`-sdb1 ntfs /media/ciro/DC74FA7274FA4EB0
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`-o`: select which columns you want exactly. Most useful information for humans:
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sudo lsblk -o NAME,FSTYPE,MOUNTPOINT,LABEL,UUID,SIZE
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`-n`: don't output header with column names. Good way to get information computationally. E.g., get UUID of `/dev/sda1`:
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sudo lsblk -no UUID /dev/sda1
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## UUID
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Unique identifier for a partition. Field exists in ext and NTFS.
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sudo lsblk -no UUID /dev/sda1
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## blkid
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`util-linux` package.
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Get UUID, label and filesystem type for all partitions:
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sudo blkid
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## Label
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An ext partitions concept.
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Determines the mount name for the partition.

‎lsblk.md

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# lsblk
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List block devices, including those which are not mounted.
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sudo lsblk
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Sample output:
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NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
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sda 8:0 0 465.8G 0 disk
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|-sda1 8:1 0 1.5G 0 part
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|-sda2 8:2 0 93.2G 0 part /media/win7
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|-sda3 8:3 0 13.7G 0 part
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|-sda4 8:4 0 1K 0 part
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|-sda5 8:5 0 338.1G 0 part /
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|-sda6 8:6 0 3.7G 0 part [SWAP]
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`-sda7 8:7 0 15.6G 0 part
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sdb 8:16 0 931.5G 0 disk
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`-sdb1 8:17 0 931.5G 0 part /media/ciro/DC74FA7274FA4EB0
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`-f`: show mostly information on filesystems:
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sudo lsblk -f
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Sample output:
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NAME FSTYPE LABEL MOUNTPOINT
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sda
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|-sda1 ntfs SYSTEM_DRV
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|-sda2 ntfs Windows7_OS /media/win7
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|-sda3 ntfs Lenovo_Recovery
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|-sda4
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|-sda5 ext4 /
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|-sda6 swap [SWAP]
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`-sda7 ext4
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sdb
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`-sdb1 ntfs /media/ciro/DC74FA7274FA4EB0
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`-o`: select which columns you want exactly. Most useful information for humans:
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sudo lsblk -o NAME,FSTYPE,MOUNTPOINT,LABEL,UUID,SIZE
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`-n`: don't output header with column names. Good way to get information computationally. E.g., get UUID of `/dev/sda1`:
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sudo lsblk -no UUID /dev/sda1

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