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Replacing a field in pipe delimited TEXT File

 
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# 1  
Old 01-06-2009
Replacing a field in pipe delimited TEXT File
Hi,
I want to replace a field in a text delimited file with the actual number of records in the same file.

Code:
HDR|ABCD|10-13-2008 to 10-19-2008.txt|10-19-2008|XYZ
DTL|0|5464-1|0|02-02-2008|02-03-2008||||F|||||||||
DTL|1|5464-1|1|02-02-2008|02-03-2008|1||JJJ
DTL|2|5464-1|2|02-02-2008|02-03-2008|1||JJJ
DTL|3|5464-1|3|02-02-2008|02-03-2008|1||JJJ
DTL|4|5464-1|4|02-02-2008|02-03-2008|1||JJJ
DTL|0|9999-1|0|02-02-2008|02-03-2008||||F|||||||||
DTL|1|9999-1|1|02-02-2008|02-03-2008|1||zzz
DTL|2|9999-1|2|02-02-2008|02-03-2008|1||zzz
TRL|ABCD|10-13-2008 to 10-19-2008.Txt|10-19-2008|170|XYZ

I would like to replace "170" in the Tail/Last record with (8) number of records with "DTL" in the same file( 8 in the above example)...is it possible to work and write on the same file ...rather than following way where i need to O/P it to a new file and then rename the temp file with the original file?

Code:
nawk 'BEGIN{OFS=FS="|"} $1=="TRL" {$5='8'} {print}' null.txt > temporary.txt
 
nawk 'BEGIN{OFS=FS="|"} $1=="TRL" {$5='$count'} {print}' null.txt > temporary.txt


Can i work and write the output i need on the same file assuming that i have the records count stored in a seperate variable.Any suggestion wud be appreciated.


thanks,
ravi
# 2  
Old 01-08-2009
No, you have to do it using a temporary file.

Some utilities, such as perl and GNU sed have a -i or "in-place" option to do that... but they are really doing exactly the same thing and just automating it for you.
# 3  
Old 01-08-2009
It is possible in perl to read a file into an array (memory structure), do things to the array, then output the array into a file, possibly overwriting the same file. This is probably harder than simply making a temp file.
# 4  
Old 01-08-2009
MySQL
Thanks guys...

I just stuck to the solution i mentioned....outputting it to a new temporary file...its easier that way.


thanks,
R
 
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