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Old 12-13-2009, 08:35 PM   #1
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find and replace (probably with sed) or some other linux commands

The file I would like to to replace is almost 1GB.

Here is an example.

,A,B,,,,,C,c,,,"Test, This",,

replace to

"",A,B,"","","","",C,c,"","","Test, This","",""

Thanks in advance.

Old 12-13-2009, 08:45 PM   #2
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use gawk for big files
awk -F"," '{
        if( $o =="" ){
        printf $o","
    if ($NF==""){ $NF="\042\042" }
    print $NF
}'  file
Old 12-14-2009, 06:57 AM   #3
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Thank you very much ghostdog74.

It worked well except in two scenarios. One is very rare

1. when there are more than one , in double quotes eg. "Test,, This"
2. It didn't replace comma at the end. eg. a,b,, should be a,b,"","".

Both are minor and I think I should be able to tweak the code. I appreciate your help.



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