Learn more about Linux ldconfig

Linux ldconfig is a tool for dynamic link library management, which can help the system find and load shared libraries at runtime. It is mainly used to update the system's dynamic linker runtime connection library cache to ensure that the program can correctly link to the shared library.

ldconfig is mainly used for two aspects: one is to add and delete shared library paths, and update relevant information to the configuration file; the other is to regenerate the cache of the dynamic link library linker based on the path in the configuration file.

The following will introduce specific code examples of how to use ldconfig.

1. Add the shared library path and update the configuration file:

First, open the terminal and execute the following command with root privileges to add a new shared library path to the configuration of ldconfig In the file:

echo "/usr/local/lib" > /etc/ld.so.conf.d/localLib.conf

This command will add "/usr/local/lib" to the ldconfig configuration file so that the system can find shared libraries in this path.

Next, run the following command to update the ldconfig cache:

ldconfig

In this way, the system will regenerate the ldconfig cache and include the new shared library path "/usr/local/lib".

2. Delete the shared library path and update the configuration file:

If you need to delete a shared library path, you can execute the following command:

rm /etc/ld.so.conf.d/localLib.conf

This command will Delete the "/usr/local/lib" path added in the configuration file.

Run the ldconfig command again to update the cache:

ldconfig

In this way, the system will regenerate the ldconfig cache and no longer contain the deleted shared library path.

Through the above example, we can see how to use the ldconfig command to manage the system's shared library path to ensure that the system can correctly load the required shared libraries. Please note that you should be careful when modifying configuration files to avoid causing system operation problems.

I hope the above introduction can help you better understand and use the Linux ldconfig tool.

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