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Shared Libraries

Dynamic and Static

QuestionAnswer
File extension for dynamic libraries .so or .so.version
File extension for Static libraries .a
Where shared libraries are stored /usr/lib and /usr/local/lib
Contains special files and utilities needed for Linux to handle dynamic libraries. Finds and loads the shared libraries needed by a program /lib/ld.so
Contains a simple list of directories to scan for libraries, in addition to `/usr/lib' and `/lib', which are hardwired. /etc/ld.so.conf
A file created by ldconfig and used to speed linking. /etc/ld.so.cache
Environment variable to specify additional directories to search for library files LD_LIBRARY_PATH
Find out which libraries are used by another library (library dependencies ldd
ldd Options: Dispay all info (Verbose) ldd -v
ldd Options: Display unused direct dependencies ldd -u
ldd Options: Updates symbolic links – but not cache ldd -N
ldd Options: Updates links contained in directories ldd -n
ldd Options: Updates cache – but not symbolic links ldd -X
ldd Options: Changes the configuration file from /etc/ld.so.conf default ldd -f
ldd Options: changes the cache location for the /etc/ld.so.cache default ldd -C
ldd Options: Treat a new directory as if it were the root directory ldd -r
ldd Options: Display current library cache ldd -P
ldd Option: Display version number of ldd ldd --version
File containing a list of colon, space, tab, newline, or comma-separated directories in which to search for libraries. /etc/ld.so.conf
File containing an ordered list of libraries found in the directories specified in /etc/ld.so.conf, as well as those found in /lib and /usr/lib. /etc/ld.so.cache
Command used to create the /etc/ld.so.cache file which speeds up linking ldconfig
Reloads the library cache every time libraries are added or removed - creates the necessary links and cache for the most recent shared libraries found in the directories specified on the command line, in the file /etc/ld.so.conf ldconfig
ldconfig Options: Summarizes the directories and files it is registering as it reloads the cache ldconfig -v
ldconfig Options: Update symbolic links, but not the cache ldconfig -N
ldconfig Options: updates the cache but not sysmbolic links ldconfig -X
ldconfig Options: Updates the links contained in drectories specified on the command line ldconfig -n
ldconfig Options: Change the configuration file from the /etc/ld.so.cache default ldconfig -f
ldconfig Options: Change the cache location for the /etc/ld.so.cache default ldconfig -C
ldconfig Options: Treat a new directory as if it were the root directory - useful when recovering a corrupted system or installing a new OS ldconfig -r
ldconfig Options; Display the current library cache, including all the library directories and their respective libraries ldconfig -p
Created by: johnadream
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