Access to devices in 14.linux

One Device access
1. Equipment identification
/DEV/XDXN # #硬盘设备/DEV/SDA1
/dev/cdrom # #光驱
/dev/mapper/* # #虚拟设备

2. Use of the device
# # "Discovery of Equipment" # #
Fdisk-l # #查看真实存在的设备
Cat/proc/partitions # #系统能够识别的设备
Blkid # #系统能够挂载使用的设备id
DF # #查看设备被系统使用的情况

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# # "Use of equipment" # #
1. Mounting of the device
Mount Device mount point
Mount/dev/sdb1/mnt #把系统中第二块硬盘的第一个分区挂载到 the/mnt directory

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2. Uninstalling the device

Umout Equipment | mount point

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If the following conditions occur:
[Email protected] ~]# UMOUNT/DEV/SDB1
Umount:/home/kiosk/desktop/photo:target is busy.
(In some cases useful info aboutprocesses this use
The device is found by lsof (8) or fuser (1))
Solve:
FUSER-KVM Device | mount point-K kill,-V show details,-m scan device
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# # # #2. Soft and Hard Links # # #
Ls-i # #查看文件节点号
Ln-s/file/file1 # #软链接 multiple nodes corresponding to a block of data

Ln/file/file1 # #硬链接 A node corresponds to multiple blocks of data

A hard link is a copy of the file in order to save the device node number

Soft links When file shortcuts, in order to save device storage fast

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Hard links Delete one file and another can find

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Soft connection Delete one file, another cannot be found, cannot find

# # # #3. File Search # # #
1.locate filename # #在文件数据库中搜索filename信息, updatedb update file database

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2.find

Find Lookup Location-condition condition value-exec action {} \;

-exec  command {} \; # # #对查找出的结果做相应处理

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Copy the files in the root directory to the/mnt/mailbackup/group Mail

-name

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-user Users
-group Group

-A and relationship
-O or relationship

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-size Numbers |-Digital |+ NUMBER # # #查找大小符合条件的文件

--maxdepth Max Depth
--mindepth min. depth

Create a file first

DD If=/dev/zero of=/mnt/file1 bs=1024 count=10
DD If=/dev/zero of=/mnt/file2 bs=1024 count=20
DD If=/dev/zero of=/mnt/file3 bs=1024 count=30

DD # #数据截取
If # #数据模板
of # #数据存放文件
BS # #数据快大小
Count # #数据快个数

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--perm 444 # # #文件全权必须是rrr
--perm-444 # # #文件每一位都要含有r权限
--perm/444 # # #文件任意一位含有r权限

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-type F File
Catalog D
C-Character device
B-Block Equipment
s set of section words
L Link
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Change permissions

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Access to devices in 14.linux