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Linux batch modification file name suffix
Modification method: 1. Use the rename command; 2. Use the mv command; 3. Use shell script; 4. Use the find command, etc. If you want to know more about Linux, you can read the articles below this topic.
How to check which port number is occupied by a program in LinuxThe way to check the port number occupied by a program in Linux is: 1. The netstat command, which checks the network connection and monitoring status of the system; 2. The lsof command, which can list the files and process information currently opened by the system; 3. The ss command, an alternative tool to netstat , providing faster and more efficient network connection information query; 4. /proc file system, you can obtain relevant information by accessing files in these directories.
How to add mysql system environment variables in LinuxLinux adds mysql system environment variable After installing mysql yesterday, I added exportPATH=/usr/local/mysql/bin directly in the line above exportPATH, and then found that all mysql commands can be used normally. I am very happy. I was dumbfounded the next day. After Linux started, it was always in the login state. After entering the account and password, it was still in the login state. After checking online, it turned out that the code I added destroyed the profile file, which directly caused the startup of all systems to fail. Then ctrl+alt+F2 to directly enter the command line mode, and then you can log in normally after modification. So I still can’t modify the configuration in the same way as under Windows.
How to create users, add and modify shells in Linux1. Create user useradd-d/test-s/bin/bash-mtest-d: Specify the user's home directory -s: User's login shell -m: Create the user's home directory Create a password: passwdtest Then enter the new password twice 2 , View the created user vim/etc/passwd. This file records the information of all users, with 7 pieces of information separated by 6 colons: such as: root:x:0:0:root:/root:/bin/bash3, Modify the user's login shell1) Command modification: usermod-s/sbin/nologintestusermod-s/bin/falsetest.
How to install mysql default configuration file location in LinuxThe solution is as follows: 1. Use the whichmysqld command to view the installation location of mysql 2. Use the /usr/local/mysql/bin/mysqld–verbose–help|grep-A1’Defaultoptions’ command to view the default path of the configuration file used by mysql. (Note that the red mark is the mysql installation directory path obtained through the command in step 1) As shown in the above figure, we can see that the order and location of mysql reading configuration file paths, first check under /etc/mysql/
How to check the number of lines in a file in LinuxHow to check the number of lines in a file in Linux: 1. wc command. The wc command plus parameter "-l" can check the number of lines in the file; 2. cat and wc commands. Use the cat command to output the file content to the terminal, and then use the wc command. Count the number of lines; 3. sed command, use "sed -n" to view the number of lines in the file; 4. awk command, use "awk 'END{print NR}'" to view the number of lines in the file.
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