x101@x101:~/level4$ cat testFile.txt
this is a line
this is also a line
you should ignore this line0.0
you should also ignore this line 0.0
this one you should see
you sh0.0ld see this one

x101@x101:~/level4$ cat testFile.txt | grep -v '0.0'
this is a line
this is also a line
this one you should see

x101@x101:~/level4$ cat testFile.txt | grep -v '0.0$'
this is a line
this is also a line
this one you should see
you sh0.0ld see this one

x101@x101:~/level4$