Help with awk script

Shell Programming and Scripting
1

Hi,

cat test.log
ABC
DEF
DDD
EFG
ABC
DEF
GGG
EFG
XYZ
EFG

I have a file "test.log" and I would like to find the last occurrence of the string DEF and would like to find the value EFG using awk. Can someone help me finding this out?

Thanks,
RK

2

That seems pretty pointless.

What's the actual objective?

3

Is there more one each line?
What do you mean by 'value EFG'?

4

I must agree: your question is rather vague.

However, is this what you're looking for?

$ awk '/DEF/{DEF=NR} /EFG/{EFG=NR} END{print "Last DEF is on line "DEF"\nLast EFG is on line "EFG}' test.log 
Last DEF is on line 6
Last EFG is on line 10

If you like to see the last occurrence of every word:
$ awk '{list[$1]=NR} END{for (string in list){print "Last occurrence of "string": "list[string]}}' test.log |sort
Last occurrence of ABC: 5
Last occurrence of DDD: 3
Last occurrence of DEF: 6
Last occurrence of EFG: 10
Last occurrence of GGG: 7
Last occurrence of XYZ: 9

Eric