Create symbolic links (ln -s) for a set of files using the same source and
target locations.
positional arguments:
source The directory of the source files.
target The directory of the target links.
files JSON file containing a list of files to be linked.
optional arguments:
-h, --help show this help message and exit
-s, --script Write a script file to STDOUT instead of executing commands.
source and target directories must include trailing '/'. Use
'${env-name}' if environment variables should be output.
The format for the JSON file is a list of a list of pairs. [["target-link-
name", "source-file-name"],...]