You dont need the back quotes and Yes you can use sqlplus to execute the stored procedure. Use a "here" document to execute your statement. You can embed both SQL and PL/SQL in the block. Here is a
<<Link>> to a thread that may be of some benefit to you.
the '-s' option puts sqlplus in silent mode
sqlplus -s $USER_ID/$USER_PWD << SQLSTRING
#call package here
#or
#write your SQL and place the block
#inside here. Anything you put in here must
#be valid SQL syntax. Also, for your benefit,
#if you put PL/SQL in here, make sure that
#your DECLARE and END; are not indented
#or spaced in any way. They must be on
#the left margin.
SQLSTRING