how to finding the exact pattern

Shell Programming and Scripting
1

I have a output like below:

A1
B2
C1
D3
A12
B4
A14

I am trying to find A1 by using grep

grep -i "A1"

But I got

A1
A12
A14

So, How can I found only A1? Please suggest.

2

could try as..

grep -i 'A1$' inputfile
or
grep -iw 'A1' inputfile
1 Like
3 
awk '/A1$/' File_Name

(OR)

grep "A1$" File_Name
4

using 'A1$' is ok for the example in the top post. but it is NOT secure.
e.g.

A1
aA1
bA1

if apply the pattern on the file above, all lines will be printed out.

I think the right solution would be

grep -Fx "A1",

.
example:

kent$ echo "A1
A12
aA1
 A1
A1 " | grep -xF "A1"
A1
5

if A1 is alone on the line you can use

grep "^A1$"

if A1 may be mixed with other data

grep -w "A1"