I have given file with three columns,example:

mm234 5 22
mn237 6 45
de987 4 41

I have to check for input values in second and third column and if it is not numeric I have to deleted using grep function. I keep trying. But help from pros might help me.
We know that there is only one delimiter between columns!
Thanks for help.

Lube.

Show us what you tried.

Hello there again, this is code I am having so far:
grep '.[[:space:]][0-9][[:space:]][0-9][0-9]$' $studentGrades > file5
grep '.[[:space:]][0-9][[:space:]][0-9][0-9][0-9]$' $studentGrades >> file5

I am wondering if it is possible to somehow write this two lines of code using only one line, I mean to combine them somehow into one.
Thanks!!!

This should do.

awk ' { x=$1;
if($2~/^[[:digit:]]*$/) x=x" "$2;
if($3~/^[[:digit:]]*$/) x=x" "$3 ;
print x} ' a