How to set LD_LIBRARY_PATH?
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In this article, we will set the correct way to set the environment variable LD_LIBRARY_PATH. Additionally, we will see the wrong way to set LD_LIBRARY_PATH (why it is wrong?) and an alternative way using bashrc.
In short, you can use the following command:
We will cover the following points in this guide:
- Set LD_LIBRARY_PATH
- Wrong way to set LD_LIBRARY_PATH
- Alternative way using bashrc
LD_LIBRARY_PATH is an environment variable that is used to set paths to shared libraries (that is .so files) so that it available during execution of executables.
The correct way to set LD_LIBRARY_PATH is as follows:
Wrong way to set LD_LIBRARY_PATH
The wrong way to set LD_LIBRARY_PATH is:
This is because it will override all existing values in LD_LIBRARY_PATH. Hence, if your code depends on multiple libraries which are located at different location, then if all paths are set except one and you set the last path using the above wrong way, then all previous paths are overridden and you need to set all paths again.
This can be tedious if you are setting LD_LIBRARY_PATH manually.
Alternative way using bashrc
Another approach is to add the export command to this file:
The advantage of this approach is that the LD_LIBRARY_PATH will be set everytime the shell is opened.
The command to add the LD_LIBRARY_PATH command is as follows:
echo 'export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/absolute_path/' >> ~/.bashrc
bashrc is a BASH shell script that is run everything an interactive shell session is started. It is used to:
- Run commands at the beginning of a shell session
- Set environment variables (like OMP_NUM_THREADS) at the start of a shell session
- Set alias for various purposes like make python point to python3
This is how the file "bashrc" looks by default:
export CLICOLOR=1 export LANG="en_US.UTF-8" alias cp="cp -i" alias ls="ls --color=auto" export PS1="\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ " export EDITOR="vim"
Let us take an example where we need to set the following path to LD_LIBRARY_PATH:
Then, the command will be:
Alternatively, we can add the path in bashrc if you need this again when you start the session:
echo 'export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib' >> ~/.bashrc
With this article at OpenGenus, you have the complete idea of how to set the environment variable LD_LIBRARY_PATH.