search path and link path

The search_path and link_path variables control the directory in which PT searches for design data. This variables specifies a list of directory paths that PT uses to find the designs, libraries, and other files.
The search_path variable typically includes paths to design database files, technology libraries, and timing models.
For elements in the link_path list other than an asterisk, PT searches for a library that has already been loaded. If that search fails, PT searchs for a name using the searh_path variable.

for example,

1. Set the search_path variable with the set command. The value should be a list of paths to the directories containing the design files, timing models files, and library files needed for the analysis.
Delimit each path with a space enclose the list in double quotation marks (* *).

pt_shell>set search_path ".  /u/project/design \
                         /u/project/library"
. /u/project/design /u/project/library


2.Set the link_path variable with the set cmd. The value should be a list of the library name.
Use an asterisk  (*) to make PT search for designs in memory.
Delimit each element with a space and enclose the list in double quotation marks (" ").

pt_shell> set link_path "* STDLIB.db"
* STDLIB.db