specify substitution tokens. Substitution tokens begin and end with a percent
sign (<tt>%</tt>) and are replaced by the corresponding text. Any substitution
token may be given on any <tt>command</tt> line but some are more useful than
others. In particular each command <em>should</em> have both an <tt>%in%</tt>
specify substitution tokens. Substitution tokens begin and end with a percent
sign (<tt>%</tt>) and are replaced by the corresponding text. Any substitution
token may be given on any <tt>command</tt> line but some are more useful than
others. In particular each command <em>should</em> have both an <tt>%in%</tt>