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Output all lines in the file temp that contain the word dog
using GREP only and in one line!!!

I tried grep '[[:space:]]dog[[:space:]]' temp

but it doesnt catch word dog when is at beginning...

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 >>...

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...