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Old 12-03-2003, 04:06 AM   #1
ganninu
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Converting a paragraph into a one-line string


Suppose I have 2 paragraphs of text such as:
"hello world 1
hello world 2
hello world 3"

linux rules 1
linux rules 2
linux rules 3"


and i want to convert each paragraph into a one line string such as "hello world 1, hello world 2, hello world 3" and "linux rules 1, linux rules 2, linux rules 3" (delimited by commas). I did it using a C program by detecting "/n" characters. But, honestly, I'd like to do it using a simple bash script - i know dat it can be done cos i've made it once, but i just cannot remember how i've done it.

Moreover, how can i control the size of a file, in a similar way as logrotate does? - i have this file here which i continusouly append data to it, but only the 50 recent entries are needed... Or for assurance, the last 100 entries, to be on d safe side that all previous entries have been processed.

thanks a lot, ganninu

Last edited by ganninu; 12-03-2003 at 04:12 AM.
 
Old 12-03-2003, 04:45 AM   #2
jkobrien
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With awk, you could do it like this...

awk 'NR == 1 {printf $0} NR > 1 {printf ", %s",$0} END {printf "\n"}' FILENAME

I'm sure you could use sed as well.

For your other question, I don't know. How about a crontab that uses tail -100
and overwrites the file?

John

Last edited by jkobrien; 12-03-2003 at 04:47 AM.
 
Old 12-03-2003, 04:58 AM   #3
ganninu
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Thanks jkobrien,

it worked for that particular example of having two paragraphs.

Now i hope to get it work as a general case since i simplified my problem - I have a big log file (i.e. with more than two paragraphs) where each record is displayed as a paragraph. The paragraphs are seperated by a blank line. In order to process the data, I need to convert the file such that each paragraph is displayed as a line...
 
Old 12-03-2003, 06:32 AM   #4
ganninu
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I have done it in bash, and this is the way i've used:


while read line

do

if [ "$line" = "" ] #this is used to seperate the lines...
then echo
fi

echo -n "$line" # Output the line itself.

done

exit 0

Last edited by ganninu; 12-03-2003 at 06:34 AM.
 
Old 12-03-2003, 07:50 AM   #5
jkobrien
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Well if you don't care about having a comma at the end of each line then the following will work...

awk '$0 != "" {printf "%s, ",$0} $0 == "" {printf "\n"}' FILENAME

You can always pass through the file again with awk or sed to get rid of the final comma.

John
 
  


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