To execute commands in the root file, you need to obtain root permissions:
Use the su command, enter the password:
to obtain root privileges, and use other commands to read the root directory and create files in root
Note: Under the root authority, you need to add # before the command, indicating that you have the authority as a super user, so as to prevent the computer from automatically removing the authority.
Linux basic commands
1. Modify the content of the file:
1. Redirect: >
# ls -a > cat.txt
You can write something into the cat
2. Write the information in the root directory to cat.txt:
# ls / > cat.txt
Check if it is written in:
# cat /cat.txt
3. Text editor
(1) cat syntax: input the result of viewing the directory into another file
# cat /home/jncan/aaa > cat.txt
(Indicates that the result of aaa is input into cat.txt)
Check whether it is input:
# cat /cat.txt(2) gedit: graphic file editor
["g" means graphics, "edit" means edit]
[jncan@localhost ~]$ su
密码：
[root@localhost jncan]# gedit /1.txt
(gedit:6874): GLib-GIO-CRITICAL **: 17:00:34.889: g_dbus_proxy_new_sync: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
(gedit:6874): dconf-WARNING **: 17:00:34.917: failed to commit changes to dconf: 连接已关闭
(gedit:6874): dconf-WARNING **: 17:00:34.923: failed to commit changes to dconf: 连接已关闭
Error creating proxy: 连接已关闭 (g-io-error-quark, 18)
Error creating proxy: 连接已关闭 (g-io-error-quark, 18)
Error creating proxy: 连接已关闭 (g-io-error-quark, 18)
Error creating proxy: 连接已关闭 (g-io-error-quark, 18)
Error creating proxy: 连接已关闭 (g-io-error-quark, 18)
A box appears in the terminal, namely Notepad cat.txt
Write a new graphic file: directly add a new file name.
Example: # gedit /2.txt
(3) vi and vim
command line: # vim /1.txt
Open the text editor -> enter i -> enter the insert mode
. In the insert mode, editing and modification of the notepad is not allowed. You need to press the i key again, and the insert appears , and you can edit the notepad.
When you want to return to the command line, you need to press the esc key first, then enter: wq, press Enter to enter the command line mode, and press the i key again to enter the insert mode.
Commonly used functions in text editing:
(1) Copy and paste function: first press the y key twice, and then move to the number of lines you want to paste and press the p key
(2) Batch delete text: first press the number (indicates to delete several lines) two After the d key
is deleted by mistake, you can press the u key to undo it
(3) Delete a certain word in a line: move to the character and use the x key
