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Searching with a value to get an entire row

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# 1  
Old 04-24-2010
Searching with a value to get an entire row
i have the file where the 1st column is unique value.
ROLLNO,NAME ,SUB1,SUB2,SUB3,TOTAL,PERCENTAGE,RESULT
Code:
15     ,rig   ,34  ,56  ,87  ,177  ,59 %         ,PASS
23     ,wel   ,45  ,76  ,56  ,177  ,59 %         ,PASS
23     ,rew   ,23  ,45  ,67  ,135  ,45 %       ,THIRD
45     ,ramu   ,24  ,78  ,45  ,147  ,49 %       ,FAIL

i want to search the file with a given rollnum and if that prsent in the 1st column..i want that entire row to be output

i tried

Code:
cut -f1 -d "," filename | sed -ne '/"$rollnum"/p'

but getting only the rollnum if that is present but not the entire row.
plz help !!
Last edited by Scott; 04-24-2010 at 01:37 PM.. Reason: Added more code tags
# 2  
Old 04-24-2010
Try:
Code:
grep "^$rollnum " file

# 3  
Old 04-24-2010
ye.. thanks franklin..
this will work in this case..
but how about if the uniq column is the 2nd or 3rd column in the file.

plz help !!
# 4  
Old 04-24-2010
You could try:
Code:
awk -F, '$1==r' r="$rollnum" infile

use e.g. $3 if you need to match the 3rd column
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