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Want to grep exact pattern from file

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# 1  
Old 05-13-2010
Want to grep exact pattern from file
Contents of my file is:

DI
DI[0]
DIR
PHI

I want to extract only DI. I am using below command

grep -w DI <file>

but it is also extracting DI[0].

Can i use any other command to extract exact pattern where '[' does not have special meaning
# 2  
Old 05-13-2010
cat grep1 |grep -v "DI\[.*\]" |grep -w DI
# 3  
Old 05-13-2010
try
Code:
grep -w DI$  sample_file

# 4  
Old 05-13-2010
I can only think of
Code:
grep "^DI$" file

HTH
# 5  
Old 05-13-2010
cat <file>| awk '$0=="DI" {print $0}'
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