2015.9.13 VIM, permissions, and network management

Morning: Redirect:

Tadafa (| character) can connect commands

ll–l/etc/| Less

Vim Advanced text editor vim introduction

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VIM: pattern-editing device

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Modify Text: Insert mode

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Save and exit

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Move: Command mode

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Manipulating text: Command mode

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Undo Change: Command mode

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Use multiple windows

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Configuring VI and VIM

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User groups and Rights users

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Group

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Password

Stored under the/etc/shadow file

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User and group ID numbers

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Linux File Security

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Permissions classification:

R: Read

W: Write

X: Execute

User Category:

Owned by: Owner

Group: Groups

Others: Other.

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Permissions: The first "D" represents the directory, "B" represents the block device; "L" stands for the link; "-" represents no permissions

Check Permissions

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Change permissions

Change the owner of the file: chown [user name] [file]

Change the owning group for a file: chgrp [user name] [file]

Change the owner and owning group for a file: chown [user name]:[group name] [file]

Change permissions: chmod [u+x] [g+w] [file]

Change the execution rights for everyone: chmod a-x [File]

Permission code:

R=4

w=2

X=1

u= Users

G= Group

o= other users

Change file ownership:

chmod–r [Permission code] [file]

Recursive Change permissions

Afternoon: Permissions

Default License:

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For folders:

View default umask: Command umask

Maximum permission bit minus default mask as default permission

777-022=755

Modify Mask: umask [number]

For text files:

Maximum permissions minus 111 (code that executes permission x) is subtracted from the default umask

777-111-022=644

When Umask is an odd digit, the last value is added to the 1-bit default permission code

To change the configuration file:

Vim/root/.bashrc

Add umask=[number]

Valid only for the root user.

Vim/etc/.bashrc

Add umask=[number]

For all users

User Management Tools

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Group Management Tools

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Advanced Permissions

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Web Services Links:

Establish one or more links for an active network card that contains network information for a network card that can be switched over without manually changing the IP address, as long as the relevant link is activated.

Command: NMCLI connection Add type Ethernet con-name TO2 ifname eno16777736 ip4 192.168.0.2/24 gw4 192.168.1.1

To2: Name of the newly created link. eno16777736: Name of the active NIC

NMCLI connection down [NIC name (NMCLI connection show view)]

NMCLI connection up [NIC name]

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Tip: The options in the NMCLI command can be automatically complete.

Dns:

DNS Information configuration file:/etc/resolv.conf

Hostname configuration file:/etc/hostname

Local DNS resolution file:/etc/hosts. The priority is higher than the DNS server.

2015.9.13 VIM, permissions, and network management