Help with delete

UNIX for Beginners Q & A UNIX for Dummies Questions & Answers
1

Lets say,

I have a few records

EX:

10 20 account
10 20 account_K

I need to eliminate whtever records with _K

Please help..
Thanks

2 
$ cat sample2.txt
AB DFDF GFGF BB DDFDFDDG ABC 1234
BB WKSK 12SD AA SHJDSDDS DEF 1345
GH SDSD 7878 99 DHFDFDFG ABC 3434

$ cat sample2.txt | grep -v "5$"
AB DFDF GFGF BB DDFDFDDG ABC 1234
GH SDSD 7878 99 DHFDFDFG ABC 3434
3

why to use cat

 
grep -v "5$" < sample2.txt  OR grep -v "5$"  sample2.txt

Will also work