Shell Programming and Scripting

     ${parameter%word}
           Remove Smallest  Suffix  Pattern.  The  word  will  be
           expanded to produce a pattern. The parameter expansion
           then will result in parameter, with the smallest  por-
           tion of the suffix matched by the pattern deleted.

     ${parameter%%word}
           Remove  Largest  Suffix  Pattern.  The  word  will  be
           expanded to produce a pattern. The parameter expansion
           then will result in parameter, with the  largest  por-
           tion of the suffix matched by the pattern deleted.

     ${parameter#word}
           Remove Smallest  Prefix  Pattern.  The  word  will  be
           expanded to produce a pattern. The parameter expansion
           then will result in parameter, with the smallest  por-
           tion of the prefix matched by the pattern deleted.

     ${parameter##word}
           Remove  Largest  Prefix  Pattern.  The  word  will  be
           expanded to produce a pattern. The parameter expansion
           then will result in parameter, with the  largest  por-
           tion of the prefix matched by the pattern deleted.

temp=~/file.a.b.c-d.r
for var in {A..D}; do
   echo "cp $temp ${temp%?-*}1-$var${temp#*-?}"
done

tee file.a.b.{A,B,C,D}.r < file.a.b.c-d.r

cat file.a.b.c-d.r | tee file.a.b.{A,B,C,D}.r

file.a.b.{A,B,C,D}.r

file.a.b.A.r
file.a.b.B.r
file.a.b.C.r
file.a.b.D.r