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Change in last line of each part of a file

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# 1  
Old 05-25-2012
Change in last line of each part of a file
Hi,

I have a input files as below.

Sample of one input file

Code:
type mtg_key =
 record
  decimal("\344") id;
  string("\344") ct_cd;
  string("\344") st_cd;
end;
type psl_key =
 record
  decimal("\344") id;
  utf8 string("\344") st_cd;
end;
type amk_fields =
record
  decimal("\344") tx_id;
  utf8 string("\344") ty_cd;
  decimal("\344") dvr_id;
end;


required output file
Code:
type mtg_key =
 record
  decimal("\344") id;
  string("\344") ct_cd;
  string("\344\006") st_cd;
end;
 
type psl_key =
 record
  decimal("\344") id;
  utf8 string("\344\006") st_cd;
end;
 
type amk_fields =
record
  decimal("\344") tx_id;
  utf8 string("\344") ty_cd;
  decimal("\344\006") dvr_id;
end;

condition

within each type and end;
i have to replace "\344" to "\344\006" in last line for each type in file.

Please, give your ideas, i will be thankfull to you

Thanks,
Aditya
Last edited by Franklin52; 05-25-2012 at 09:32 AM.. Reason: Please use code tags for data and code samples
# 2  
Old 05-25-2012
Hmmmmm....

One way of doing it would be:

1) Reverse the input line-by-line. That is, make last line as first, 2nd from last as 2nd and so on.

2) In the "reversed" file, for each section starting with "end" and ending with "type", replace the 1st pattern (\344) with the required string (\344\006). Replacing the "first" pattern is much easier than replacing the "last" pattern because you don't know what "last" is.

3) Reverse the file again.


Just an idea...feel awk could do it...would you try it?
# 3  
Old 05-25-2012
Elixir_sinari's suggestion is definitely the most fool proof, but is it accurate to say if the last field equals "st_cd;" or "dvr_id;", then change 344 to 344\\006:

Code:
#!/bin/ksh
 
awk ' {
   if(($NF == "st_cd;") || ($NF == "dvr_id;") )
      gsub("344", "344\\006")
   print $0
} ' input.txt

# 4  
Old 05-26-2012
OK guys...

2) is a piece of cake for awk....

for 1), you can use
Code:
tac

for 3) use another
Code:
tac

on the output of awk.

How's that???
# 5  
Old 05-26-2012
How about perl ?
Code:
perl -pe '$/=undef;s/\(\"\\344\"\)(.*?)(\n\s*end;)/\(\"\\344\\006\"\)$1$2/mg;' filename

# 6  
Old 05-26-2012
Try:
Code:
awk '/type/{print x}1' infile | awk '{sub(/\\344/,"\\344\\006",$(NF-1))}1' FS='\n' OFS='\n' RS= ORS='\n\n'

# 7  
Old 05-28-2012
Thanks to all for your ideas... i am trying and working on it.

Thanks,
Aditya
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