Delete last value from pipe delimited file


 
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# 1  
Old 02-16-2010
Data Delete last value from pipe delimited file

I have a large(ish) pipe delimited file.

The last line of the file contains a total row count and a checksum:

END|1537451|1328569446

After making other adjustments to the file, I need to strip out the checksum and apply a new value - I have a script to generate the checksum and 'cat' it back to the main file,
However I am failing in removing the original value - I need the data to look like:

END|1537451|

I was thinking of using sed, however I was unsure how to pass a regex arguement to delete everything after the last pipe.

Any assistance will be greatly appreciated.

Sean R
# 2  
Old 02-16-2010
Bug Perhaps with awk

Code:
>cat file1
1 2 1 2 1
1 2 1 2 1
1 2 1 2 1
END|1537451|1328569446


>gawk '{FS=IFS=OFS="|"; if($1=="END"){print $1,$2"|"}else{print $0}}' <file1
1 2 1 2 1
1 2 1 2 1
1 2 1 2 1
END|1537451|

# 3  
Old 02-16-2010
Or sed:
Code:
newval=654321
sed '$s/[^|]*$/'"$newval/" infile

Code:
1 2 1 2 1
1 2 1 2 1
1 2 1 2 1
END|1537451|654321

# 4  
Old 02-17-2010
Thanks people,

Both worked but the sed seems slightly faster.

Many thanks for your assistance Smilie
 
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