Deleting Records from LD_LIBRARY_PATH

Question

I am experimenting with shared Linux libraries and added an entry ( export LD_LIBRARY_PATH=/path/to/library:${LD_LIBRARY_PATH} ) to $ LD_LIBRARY_PATH . Now I want it to disappear. How can i do this?

PS. Entering echo $LD_LIBRARY_PATH , before I added the entry, gave me an empty string. Now he says:

path / to / library:

Answer 1

If he previously gave you an empty string, this (most likely) means that the variable has not been set (by default it is not set), so you can just turn it off:

 unset LD_LIBRARY_PATH 

Several other experiment options:

 export MY_PATH=/my/path export MY_PATH2=/my/path2 export LD_LIBRARY_PATH="${MY_PATH}:${MY_PATH2}" echo $LD_LIBRARY_PATH /my/path:/my/path2 

Removing a path from the end:

 export LD_LIBRARY_PATH="${LD_LIBRARY_PATH/:${MY_PATH2}/}" echo $LD_LIBRARY_PATH /my/path 

Similarly, removing the path from the beginning (if set above):

 export LD_LIBRARY_PATH="${LD_LIBRARY_PATH/${MY_PATH}:/}" 

Answer 2

Assuming you are using bash , you can set it back to the empty path using:

 export LD_LIBRARY_PATH="" 

And if you want to export it:

 export -n LD_LIBRARY_PATH 

The bash man page is great documentation to help deal with this issue.