Shell Programming and Scripting

Dear All,

Please help me out for the below query

Code:

echo 'please input file type (i.e file1,file2,file3,file4): '
read a
cat hello.wri | grep $a | wc -l > temp1.wri
cat hello.wri | grep $a | wc -l > temp2.wri
cat hello.wri | grep $a | wc -l > temp3.wri
cat hello.wri | grep $a | wc -l > temp4.wri

now the query is that it depends upon user, which filetype wil he use (i.e. file1,file2,file3,file4)
i want that if subscriber write file3
than only temp3.wri should be created and the rest command should be skipped and no files for temp1.wri,temp2.wri
temp4.wri should be generated. only files for temp3.wri should be generated
as per my understanding, (if) loop will be used


please advice

If it is a college assignment... Not allowed here ...

Code:

echo 'please input file type (i.e file1,file2,file3,file4): '
read a
i=`echo $a | cut -c5-`
cat hello.wri | grep $a | wc -l > temp"$i".wri