UNIX for Dummies Questions & Answers

Need to find only unique values for a given tag across the files:

For eg:

Test1:
<Tag1>aaa</Tag1>
<Tag2>bbb</Tag2>
<Tag3>ccc</Tag3>

Test2:
<Tag1>aaa</Tag1>
<Tag2>ddd</Tag2>
<Tag3>eee</Tag3>

Test3:
<Tag1>aaa</Tag1>
<Tag2>ddd</Tag2>
<Tag3>eee</Tag3>

Test4:
<Tag1>bbb</Tag1>
<Tag2>ddd</Tag2>
<Tag3>eee</Tag3>

grep "<Tag1>" test* --> This command will return the following
test1:<Tag1>aaa</Tag1>
test2:<Tag1>aaa</Tag1>
test3:<Tag1>aaa</Tag1>

But I need the following results:

test1:<Tag1>aaa</Tag1>
test4:<Tag1>bbb</Tag1> ==> I don't want "test2" and "test3" to appear since they are same as "test1" results

What have you tried so far? Which unix utilities are you using?

Are you posting homework problems?

I have used grep command. This gives me all the occurances. I only need unique occurances.

No, this is not a home work problem

I need to do this in production. I have simplied my production problem using a simple example.

hi buddy,

use this
grep "<Tag1>" tag|uniq

Sorry Buddy, wrong approach. Here is the solution,

Code:

grep "<Tag1>" test*|sort -t: -k2 -u

Cheers,
K

Code:

awk '/<Tag1>/ { arr[$0]++ }END{ for ( i in arr ) { print i } }' test[1-4]

Thank you very much. Both of them work!