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Unix Script to parse a CSV

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# 1  
Old 09-09-2008
Unix Script to parse a CSV
I am writing a unix script that will parse a CSV and edit the values. My CSV looks like this
0,0,0,0,1,0,1,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0
10,11,7,0,4,12,2,3,7,0,11,3,12,4,0,5,5,4,5,0,8,6,12,0,9,3,3,0,2,7,8
19,11,7,0,4,14,16,10,8,2,13,7,15,6,0,76,6,4,10,0,18,10,17,1,11,3,3,0,9,9,8
22,11,13,1,5,14,16,10,9,10,13,7,16,6,0,59,6,4,10,0,18,13,17,1,11,3,3,0,12,9,10
22,11,13,1,5,14,16,10,9,10,13,7,16,6,22,90,6,4,10,0,18,13,17,1,11,3,4,0,12,9,10
41,18,27,9,27,41,59,20,27,54,63,34,28,43,40,131,7,8,19,0,62,16,30,23,25,3,4,9,24,12,19
42,18,27,9,27,41,59,20,27,55,68,36,28,46,41,132,7,8,19,13,64,16,31,25,25,3,4,9,24,12,19
125,124,78,62,97,87,145,70,87,119,150,124,99,95,41,175,85,58,57,88,142,83,92,102,107,80,45,64,64,94, 89
125,126,78,62,99,87,145,70,87,119,161,124,99,95,41,175,85,58,58,88,142,84,112,103,108,80,68,64,65,98 ,89
189,254,164,153,192,153,230,132,188,163,210,210,167,198,93,235,146,110,97,130,211,107,181,140,151,11 9,105,105,178,126,165
189,324,168,192,194,159,233,132,192,169,244,210,167,201,103,235,147,152,180,181,213,107,192,190,212, 119,119,126,195,126,166
189,324,168,255,194,225,233,141,192,230,244,260,167,201,172,283,181,206,217,216,261,107,192,235,212, 119,169,197,264,189,229
366,438,315,319,382,287,398,320,416,382,407,397,342,448,276,392,297,368,237,347,336,332,384,405,412, 284,329,350,396,326,356


This script would run every hour on the hour deleting the first value on a specific line and adding a new record to the end of that same line. So for instance at 8:00am I might delete the 0 from the first line and add a 10 at the end. I also have a version of the CSV that has the time as the first value of each row. I have tried both awk and sed and I can't figure out how to replace a value at a specfic location. I think I can delete the first value in row 1 using this code snippet, but I dont know how to add the value to the end of the same row. Is there a way to parse the csv into a two dimesional array and then output it back into a csv at the end? It probably isn't the most efficient way but it would work.
I hope this isn't too confusing. Please let me know if you need more information. Thanks

Code:
 
sed '1s/^[^,]*,//' file.csv

# 2  
Old 09-09-2008
In perl, you'd 'slurp' in the file, break it into an array.
You'd request the line of the array that you wanted, split it into a new array.
You'd pop the array to shorten it by one, unshift your new value to the front of the new array.
Then, you'd turn the array back into a string, and put it back into the same place in the original array.
Finally, you'd rewrite the original file with the new data.

It's not too hard, but expect it to take a couple of hours to write.
# 3  
Old 09-09-2008
Quote:
Originally Posted by RJ17
So for instance at 8:00am I might delete the 0 from the first line and add a 10 at the end.
Code:
sed -e '1s/^[^,]*,//' -e '1s/$/,10/' file

# 4  
Old 09-10-2008
danmero,
Thanks for the help. It is possible to add the 10 to the end of the line instead of the beginning. This line of code converts
0,0,0,0,1,0,1,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0
to
,10,0,1,0,1,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0

Ideally the new line would look like this
0,0,0,1,0,1,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0,10
# 5  
Old 09-10-2008
Here is the output:
Code:
#  echo "0,0,0,0,1,0,1,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0" | sed -e '1s/^[^,]*,//' -e '1s/$/,10/'
0,0,0,1,0,1,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0,10

# 6  
Old 09-10-2008
It does work the when I use the echo command on just the one line but when I run it on my entire csv file it shows
,10,0,1,0,1,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0
10,11,7,0,4,12,2,3,7,0,11,3,12,4,0,5,5,4,5,0,8,6,12,0,9,3,3,0,2,7,8
19,11,7,0,4,14,16,10,8,2,13,7,15,6,0,76,6,4,10,0,18,10,17,1,11,3,3,0,9,9,8
22,11,13,1,5,14,16,10,9,10,13,7,16,6,0,59,6,4,10,0,18,13,17,1,11,3,3,0,12,9,10
22,11,13,1,5,14,16,10,9,10,13,7,16,6,22,90,6,4,10,0,18,13,17,1,11,3,4,0,12,9,10
41,18,27,9,27,41,59,20,27,54,63,34,28,43,40,131,7,8,19,0,62,16,30,23,25,3,4,9,24,12,19
42,18,27,9,27,41,59,20,27,55,68,36,28,46,41,132,7,8,19,13,64,16,31,25,25,3,4,9,24,12,19
125,124,78,62,97,87,145,70,87,119,150,124,99,95,41,175,85,58,57,88,142,83,92,102,107,80,45,64,64,94, 89
125,126,78,62,99,87,145,70,87,119,161,124,99,95,41,175,85,58,58,88,142,84,112,103,108,80,68,64,65,98 ,89
189,254,164,153,192,153,230,132,188,163,210,210,167,198,93,235,146,110,97,130,211,107,181,140,151,11 9,105,105,178,126,165
189,324,168,192,194,159,233,132,192,169,244,210,167,201,103,235,147,152,180,181,213,107,192,190,212, 119,119,126,195,126,166
189,324,168,255,194,225,233,141,192,230,244,260,167,201,172,283,181,206,217,216,261,107,192,235,212, 119,169,197,264,189,229

I dont know why this is, but it doesn't make sense to me.
# 7  
Old 09-10-2008
Quote:
Originally Posted by RJ17
I dont know why this is, but it doesn't make sense to me.
Should work, check for typo, use copy/paste
Code:
# cat file
0,0,0,0,1,0,1,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0
10,11,7,0,4,12,2,3,7,0,11,3,12,4,0,5,5,4,5,0,8,6,12,0,9,3,3,0,2,7,8
19,11,7,0,4,14,16,10,8,2,13,7,15,6,0,76,6,4,10,0,18,10,17,1,11,3,3,0,9,9,8
22,11,13,1,5,14,16,10,9,10,13,7,16,6,0,59,6,4,10,0,18,13,17,1,11,3,3,0,12,9,10
22,11,13,1,5,14,16,10,9,10,13,7,16,6,22,90,6,4,10,0,18,13,17,1,11,3,4,0,12,9,10
41,18,27,9,27,41,59,20,27,54,63,34,28,43,40,131,7,8,19,0,62,16,30,23,25,3,4,9,24,12,19
42,18,27,9,27,41,59,20,27,55,68,36,28,46,41,132,7,8,19,13,64,16,31,25,25,3,4,9,24,12,19
125,124,78,62,97,87,145,70,87,119,150,124,99,95,41,175,85,58,57,88,142,83,92,102,107,80,45,64,64,94, 89
125,126,78,62,99,87,145,70,87,119,161,124,99,95,41,175,85,58,58,88,142,84,112,103,108,80,68,64,65,98 ,89
189,254,164,153,192,153,230,132,188,163,210,210,167,198,93,235,146,110,97,130,211,107,181,140,151,11 9,105,105,178,126,165
189,324,168,192,194,159,233,132,192,169,244,210,167,201,103,235,147,152,180,181,213,107,192,190,212, 119,119,126,195,126,166
189,324,168,255,194,225,233,141,192,230,244,260,167,201,172,283,181,206,217,216,261,107,192,235,212, 119,169,197,264,189,229
366,438,315,319,382,287,398,320,416,382,407,397,342,448,276,392,297,368,237,347,336,332,384,405,412, 284,329,350,396,326,356
# sed -e '1s/^[^,]*,//' -e '1s/$/,10/' file
0,0,0,1,0,1,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0,10
10,11,7,0,4,12,2,3,7,0,11,3,12,4,0,5,5,4,5,0,8,6,12,0,9,3,3,0,2,7,8
19,11,7,0,4,14,16,10,8,2,13,7,15,6,0,76,6,4,10,0,18,10,17,1,11,3,3,0,9,9,8
22,11,13,1,5,14,16,10,9,10,13,7,16,6,0,59,6,4,10,0,18,13,17,1,11,3,3,0,12,9,10
22,11,13,1,5,14,16,10,9,10,13,7,16,6,22,90,6,4,10,0,18,13,17,1,11,3,4,0,12,9,10
41,18,27,9,27,41,59,20,27,54,63,34,28,43,40,131,7,8,19,0,62,16,30,23,25,3,4,9,24,12,19
42,18,27,9,27,41,59,20,27,55,68,36,28,46,41,132,7,8,19,13,64,16,31,25,25,3,4,9,24,12,19
125,124,78,62,97,87,145,70,87,119,150,124,99,95,41,175,85,58,57,88,142,83,92,102,107,80,45,64,64,94, 89
125,126,78,62,99,87,145,70,87,119,161,124,99,95,41,175,85,58,58,88,142,84,112,103,108,80,68,64,65,98 ,89
189,254,164,153,192,153,230,132,188,163,210,210,167,198,93,235,146,110,97,130,211,107,181,140,151,11 9,105,105,178,126,165
189,324,168,192,194,159,233,132,192,169,244,210,167,201,103,235,147,152,180,181,213,107,192,190,212, 119,119,126,195,126,166
189,324,168,255,194,225,233,141,192,230,244,260,167,201,172,283,181,206,217,216,261,107,192,235,212, 119,169,197,264,189,229
366,438,315,319,382,287,398,320,416,382,407,397,342,448,276,392,297,368,237,347,336,332,384,405,412, 284,329,350,396,326,356
# bash --version
GNU bash, version 3.1.17(1)-release (i486-pc-linux-gnu)
Copyright (C) 2005 Free Software Foundation, Inc.
# sed --version
GNU sed version 4.1.5
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,
to the extent permitted by law.
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