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help with nawk

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# 1  
Old 08-15-2011
help with nawk
hi guys,
I am writing a code and have stuck at one point. Inside nawk I am storing my desired variable a, I just need to find if a is present in an external file error.log or not. If yes, print something. grep or for loop not working properly inside nawk. Sample code provided.

Code:
nawk '
  BEGIN {
    RS=""; FS="\</XYZ\>"
  }
  {
    for(i=1;i<=NF;i++) {
      n=split($i,arr," ");
      a=arr[2] " " arr[3] " " arr[4]; # for e.g. a=TimeStamp: 08/10/2011 14:14:06
         # check if 'a' is present in file "error.log", if yes, print $i
      < missing code > 
    }
  }
' tmp > tmp1

Any leads plz.. Thanks..
# 2  
Old 08-15-2011
Try this for your missing code:

Code:
if ($0 ~ a) print $0

# 3  
Old 08-15-2011
Thanks dude2cool, but that's not what I need.

I need to see if variable 'a' is present in an external file "error.log", if it's not present I will print $i, and if 'a' is present in "error.log", just pass.

I am not able to check if 'a' is present in error.log or not as grep is not working inside nawk.

Thanks.
# 4  
Old 08-15-2011
Post around 10 relevant lines from your input and post the desired output against that input . Thanks.
# 5  
Old 08-15-2011
I am using file 'tmp' in nawk. From that I am calculating variable 'a'.
sample 'a':
Code:
TimeStamp: 08/10/2011 14:14:06
TimeStamp: 08/10/2011 14:14:51
TimeStamp: 08/10/2011 14:17:10
TimeStamp: 08/10/2011 14:19:48
TimeStamp: 08/10/2011 14:20:45
TimeStamp: 08/10/2011 14:27:16

Another file error.log:
sample error.log
Code:
TimeStamp: 08/10/2011 14:14:06
<input>
      blah blah
</input>

TimeStamp: 08/10/2011 14:27:16
<input>
      blah blah
</input>

TimeStamp: 08/10/2011 14:20:45
<input>
      blah blah
</input>


I just need to check if all 'a' i.e. all TimeStamps are present in error.log file.
I need to print the missing ones. so output would be:
Code:
TimeStamp: 08/10/2011 14:14:51
TimeStamp: 08/10/2011 14:17:10
TimeStamp: 08/10/2011 14:19:48

Thanks.

---------- Post updated at 01:52 PM ---------- Previous update was at 01:50 PM ----------

It's very easy if done separately. I need this inside nawk as given below..
Code:
nawk '
  BEGIN {
    RS=""; FS="\</XYZ\>"
  }
  {
    for(i=1;i<=NF;i++) {
      n=split($i,arr," ");
      a=arr[2] " " arr[3] " " arr[4]; # for e.g. a=TimeStamp: 08/10/2011 14:14:06
         # check if 'a' is present in file "error.log", if not, print a
      < missing code > 
    }
  }
' tmp > tmp1

# 6  
Old 08-15-2011
I should maybe use an array for a
Code:
a[arr[2] " " arr[3] " " arr[4]] = 1

Then you can have the entire first part execute with FNR==NR { all code; next }
Next, remove all a's in the second file.
Code:
{ if ($0 in a) delete a[$0]; }

Lastly, and END block to print what's left.
Code:
END { for (i in a) print a[i]; }

Then you pass tmp error.log as arguments to nawk.
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