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column extract help

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# 1  
Old 04-24-2008
column extract help
A, B, C, D, E, F, G
1, 12, 13, 100, 12345, 432, 142324
2, 432, 435, 4543, 543, 5, 436543
324, 5, 543, 4365, 43643, 436543, 436543



how to extract particular column when i need of column of A or B or C i need it to redirect into a new file.
# 2  
Old 04-24-2008
If you want to get columns by column number (cols 2 and 4 for example):
Code:
cut -d, -f2,4 inputfile

If you want to specify column id (cols " B" and " D" for example) :
Code:
awk -F, '
NR==1 {
   nbids = split(cols, ids, FS);
   for (i=1; i<=NF; i++)
     colid[$i] = i;
   for (i=1; i<=nbids; i++)
      if (ids[i] in colid)
         colsnum[++nbcols] = colid[ids[i]]
}
{
   out = "";
   for (i=1; i<=nbcols; i++)
      out = out FS $(colsnum[i]);
   print substr(out, 2);
}
' cols=" B, D" inputfile

Jean-Pierre.
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