i want to delete a file based on existing file in a directory

Shell Programming and Scripting
1

hi

i am having four files in a directory.like

1)sampleRej
2)exampleRej
3)samplemain
4)examplemain

my requirement is i have to search for the rejected files (sampleRej,exampleRej) in a directory.if these files in that directory then i have to delete the main files (samplemain,examplemain)

directoryname:: abc

please help me.

thanks

2 
#! /bin/ksh

while read file
do
        rej=${file##${file%???}}
        if [ "$rej" = "Rej" ] ; then
                echo "Remove ${file%???}main"

        fi ;
done < input.txt
3

hi

wht does this code do?

rej=${file##${file%???}}

thanks
swapneel

4

man sh -> sub topic "Parameter Expansion".

       ${parameter#word}
       ${parameter##word}
              The  word  is  expanded to produce a pattern just as in pathname
              expansion.  If the pattern matches the beginning of the value of
              parameter,  then  the  result  of  the expansion is the expanded
              value of parameter with the shortest matching pattern (the ``#''
              case) or the longest matching pattern (the ``##'' case) deleted.
              If parameter is @ or *, the pattern removal operation is applied
              to  each  positional parameter in turn, and the expansion is the
              resultant list.  If parameter is an array  variable  subscripted
              with  @  or  *, the pattern removal operation is applied to each
              member of the array in turn, and the expansion is the  resultant
              list.

       ${parameter%word}
       ${parameter%%word}
              The  word  is  expanded to produce a pattern just as in pathname
              expansion.  If the pattern matches a  trailing  portion  of  the
              expanded value of parameter, then the result of the expansion is
              the expanded value of parameter with the shortest matching  pat-
              tern  (the  ``%''  case)  or  the  longest matching pattern (the
              ``%%'' case) deleted.  If parameter  is  @  or  *,  the  pattern
              removal  operation  is  applied  to each positional parameter in
              turn, and the expansion is the resultant list.  If parameter  is
              an  array  variable subscripted with @ or *, the pattern removal
              operation is applied to each member of the array  in  turn,  and
              the expansion is the resultant list.