| Chapter five hundred sixty-seven |
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| alias |
View system alias |
67 |
| chmod |
Setting permissions for files or directories -R represents permissions recursively set all the subdirectories and files in the directory and directory Others: u: owner g: is a group o a: Everyone +: Add: - delete =: Reset |
68 |
| chown |
Owner, file chown: owner of a file chown owner: is a group file |
69 |
| umask |
The new access control file or directory View umask value: umask Set umask value: umask nnn |
70 |
| fdisk -l |
Detect and confirm the new hard drive Device: device file name of the partition boot: whether the boot partition. stat / end: the partition start / end position blocks: block default size is 1024 words id: id number corresponding partition system System: partition type |
71 |
| fdisk |
Manage disk partitions in an interactive operating environment m: View help information operation instruction p: List View partition information n: New Partition d: delete partition t: Change Partition Type w: Save the partition settings and exit q: give up the partition settings and exit ctrl + backspace key to delete the wrong character input |
72 |
| mkfs |
Create a file system (format) -t: Specifies the type of file format -b: Specifies block size in bytes -I: inode size -U: set uuid No. -q: does not display any information when performing |
73 |
| mkswap |
Create a swap file system |
74 |
| mount |
View current mount Storage mount point directory |
75 |
| umount |
Uninstall mounted file system |
76 |
| parted |
More than 2G size of the partition plan |
77 |
| getfal |
Get to see |
78 |
| setfacl |
ACL settings -m: acl subsequent setting parameters, can not be used in conjunction with -x -x: acl delete subsequent parameters, can not be used with -m -b: acl remove all parameters -k: acl remove the default parameters -R: recursively set acl parameter -d: set the default acl parameter is valid only for aircraft directory
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79 |
Chapter ownership rights and management
访问权限：
（1）读权限r：允许查看文件内容
（2）写权限w：允许修改文件内容
（2）可执行x：允许运行程序
查看文件的权限和归属：
（1）第一位表示文件类型
-：表示一般文件
d：表示目录
l：表示软链接
p：表示PIPE管道文件
s：表示socket通信套接字文件
c：表示字符设备文件
b：表示块设备文件
755是目录的默认权限
644是文件的默认权限
文件和目录满权限是777
设置别名：alias myip=‘ ’
取消别名：unalias myip
反斜杠\：转意符
删除杀掉用户：fuser -k /dev
第六章磁盘管理
一个硬盘有（1-3）个盘片，盘片有两面
磁头是最重要的地方
扇区：盘片被分为多个扇形区域，每个扇形
区存放512字节的数据
硬盘存储容量=磁头数x磁道（柱面）数x
每道扇区数x每扇区字节数
硬盘转速：转速是指硬盘盘片每分钟转动的圈数。单位：rpm
磁盘分区表示
Linux中将硬盘等设备均表示为文件
磁盘分区结构：
硬盘中的主分区数目只有4个，因此主分区和扩展分区的序号也就限制在1~4。扩展分区再分为逻辑分区，逻辑分区的序号始终从5开始。
Windows：FAT16 , FAT32,NTF
Centos7:xfs
Centos6:etx4
Centos5:etx3
getfal:
第七章文件系统与lvm
mkfs -t xfs=mkfs.xfs
32位： mkfs-t vfat -F 32 /dev/sdb6